I can totally relate. People think of the brain as having a fight or flight response but there is a third response- freezing. It is accompanied by dissociation and the inability to speak or move (in my understanding). I have experienced it and read about it. There is an excellent book written by Babette Rothschild called The Body Remembers. I used to feel a lot of shame about not fighting back but the book helped me understand that freezing was a natural and normal response to a horrifying trauma such as rape. It's a survival response.
Hugs,
AnonAmy