Coping with somatic flashbacks/physical therapy?

I've been experiencing pain I suspect is psychosomatic but have been doing physical therapy to deal with it. However, this pain is linked to a memory of being SA'd as a child, and last session I kept flashing back to the event and feeling this awful sense of anticipation of more bad things happening. I've been in a rough place emotionally and I'm worried about how well I'm going to be able to deal with the impacts of the physical therapy session I have tomorrow. Does anyone have any advice for coping with these intense somatic flashbacks? I think the physical therapy could help with how i feel in my body but it's a lot when I'm already struggling. Thanks for reading