Many years ago I was in a mental hospital and quite agitated. I saw a particular pdoc for the first and last time.... but while I was in this appointment she asked if I knew I was rocking, I said no. I have seen several Therapists since and in the course of the appointment my body will go off on its own tangent because my subconscious is unable to process the emotions.
Now that your Therapist is aware of what is happening for you hopefully you will be able to work on issues and find a way through. Its scarey at the start when you dont know what is happening. What you are experiencing is your bodies way of coping. It can also be very frustrating and tiring. Give yourself time to rest after seeing your Therapist. You will find your own path to take.
Keep posting. There are lots of people here who can talk about things with you. I have found that this site has helped me not to feel so alone.
Take Care.