Welcome to the forum Sarah.
I’ve been facilitating QHHT sessions since about 2012.
Based on what you explained can be a typical session for a practitioner and does sound normal. But I will expand on specific points you brought up.
Firstly, each person’s experience is based upon how deep they can go, and this is primarily about how open and developed the right of their brain is which includes their creative mind, in combination with their connection to spirit and frequency.
So in other words, if someone is very analytical, has had a career in a job where they are always thinking rather than being creative (e.g. an accountant or in the information technology sector), this can impact the session a bit.
I advise clients to do a range of things each day, from one to two weeks beforehand, including meditation, diet changes, concentration exercises, relaxation and a few other things, but even then, you have to understand it can take many years for that to really change someone, but it does help to a degree.
Females usually have an easier time going deeper than males on average, I find.
In relation to frequency and connection to spirit: This can be about energetic blocks within chakras and the level of spiritual development as a soul, based over many lives lived on Earth, and/or other places. Volunteer souls can be a bit different as they come in already with a higher frequency.
We can have a strong connection to spirit through the upper four primary chakras being clearer, and then the transpersonal point energy center above the crown too, but still, our body really needs to be balanced as a whole, and this takes a lot of internal work. What I mean is working on our shadow, inner child; trauma from the past and events that occurred in life from when we were a baby, up until early 20s, as this is when the chakras more fully form.
Having a regression helps with that process, and so do many other modalities like energy healing, acupuncture, reflexology, tapping, equine therapy and so much more. Plant medicine such as huachuma(san pedro) and ayahuasca can bring very strong and positive results in this regard too, especially with working on past trauma/emotions and expanding your consciousness in relation to spiritual development.
Then there are things like compatibility with the practitioner, the level of trust, if the practitioner properly used hypnotic suggestions within the interview stage, how much a person wants to control their environment as if a person has control issues, they will find it hard to let go in any situation, let alone a regression. There’s a lot of factors relating to psychology. People who have done a lot of drugs can have major difficulties too.
Also, the more sessions you do, the deeper you go each time. The hypnotic key word that can be worked out at the end of a session can actually take you deeper next time. Not many people have more than one session, but that has been my experience with clients and/or friends who come back.
When she was asking me questions ( my questions about life), I felt like making them up and speaking very fast.
This can be quite common. We not only think we made up our past lives, but can think we are making up the answers that higher self provide. What tends to happen is that you answer slowly if you are not having information (answers) coming to you straight away, fast may indicate it's flowing through well though. There are exceptions to this. A client last week was very deep, the answers came slowly, but that was simply because of the connection that was established, not how deep she was — what i could have done was specifically asked about the connection and worked on making it strong for faster answers but I felt I didn't need to as it was going fine and we didn't have time constraints.
I specifically state to clients beforehand not to analyse what comes up during the session as that can interfere with the process. So i mean you will be thinking you're making it up, you will want to analyse what you are seeing and comparing it with the time period and a whole lot more... it's important to let that go in a session and just let it flow. By doing that, you can fall more easily into the session and go a bit deeper with each scene that appears.
I find with most of my sessions that each scene and each past life and/or experience, gradually takes a client deeper and prepares them for the higher self to come through.
But thinking you're making it up doesn't mean you are making it up. I've never had a session where I felt a client had made up a past life, for example. I have had two clients who just couldn't get anything except random images that quickly went to be replaced with something entirely different, and were unable to continue and have a successful session. But it's easy for me to determine if the process is working or not.
I also explain to clients that our higher self is us, as it is. Personally, I've got a very strong connection to my higher self and my primary psychic ability is claircognizance (knowing), so when I say this I have a good understanding of it. Our guidance in life can come directly through the stream of consciousness from our higher self, and we can go through life without even realising that. (as in some of our thoughts are information from HS) So we can be rather intuitive, yet not even know. In a session, the answers that comes to us may seem like we already knew them because of this. At the same time, this can also indicate we are not as deep as we could be, based on those other factors above, but that doesn't mean the information is not accurate.
Do listen to the recording of the session, you may be surprised at some things you forgot or didn't notice, in the session.
You might be asking your self, how can I be so intuitive and not go deeper? We can bring certain gifts in with us and they can be active, while we still have blocks elsewhere, energetically speaking. But then we can do a lot of work on ourselves, and psychic abilities can manifest as a result. So the situations are not always the same for everyone.
One interesting thing I observed is when the therapist asked for healing from counsel and my higher self, in both cases I immediately felt quite heavy on my body and a shift on my sensation. This lasted for 1 minute maximum.
This is further "proof" that it was all real as this is a typical sensation to have, but we can experience things like this in unique ways.
On a different note, the session was quite long for almost 4 hours and I finished at 7 pm that day. From that time I am feeling quite lethargic and sleeping like 10-12 hours a day. I still come to work but that tired and lethargic feelings are not leaving me. Today is the 4th day after session and the tired feeling is just continuing. When I mentioned this to the therapist, she mentioned that it’s pretty normal and that’s how my higher self is giving me more messages when I am on sleep state.
My sessions are about 4 hours in length. My most recent one was a few days ago and went for four and a half hours. Some people talk longer at the start so that can take them to 5 or more.
I advise clients that they may be more tired than usual in the days after. I tell them to record any interesting dreams and take note of them for the entire week after. I also mention that they drink more water during the first few days after a session. I say all this because it relates to the healing aspects of the session. You are feeling extra tired and this is a great sign as it shows that a lot of work is taking place, and/or has taken place.
So in conclusion, a session like this is still very effective. But I totally get how you feel.
If I was to give this a score based on your feedback, on a scale of one to ten, in terms of five being an average session and10 being about getting as deep as you can, I'd give it a four or a five. The two I recently conducted at the end of last week were about a 5 and an 8 (client thought she had fallen asleep during the HS part of the session and couldn't remember most of it, also observed it taking over her at the start of that part).
For me, the average client session is probably around a six. I hope these numbers make sense. But practitioners of any modality, such as past life regression, will get a pattern of clients. So some practitioners will get clients that go deeper on average, because of that pattern, as it's not random. Some will have those that don't go as deep. All this is for a reason too, as it shapes the practitioner, and the clients, in terms of life lessons in relation to spiritual development.
As for advice with your higher self, see my thread here,
https://www.transients.info/roundtable/threads/spiritual-development.1835/.
And if you want to see some examples of my transcribed sessions, many which get into deep detail on information in a similar way to Dolores Cannon's books, they are all linked to here, including some from a few other practitioners:
https://www.transients.info/past-life-regression-articles/.
That is normal. I would like other sessions to get deeper. 
