My heart goes out to you.
Flashbacks and nightmares stink the big one.
Body memories are the worst IMO. Uggs!

I encourage you to allow yourself to just feel whatever is being brought up. Don't fight it. Your body has to remember and bring it to your consciousness in order for you to heal through it. Pushing it away will only delay the processing of it.

If you need to, write out your experiences in a journal or emails to your T if that is allowed. I had to do that in order to survive the somatic processing part.
Document what you experience and allow it to just be there.
You will get through it. And you will experience healing once you process this fully.
BIG safe hugs to you!