I have similar experiences. It's difficult to describe to my t, but I think she is starting to understand it. For me though, it's just the start of more memories coming together. I can't always sit through the sensations (because they are very disturbing), but when I do manage it, I always hit a memory... not fun.
I'm sorry you are also struggling with something similar. I also would recommend maybe talking to someone who specialized in trauma. I know when I told the doctor at the hospital about it, he categorized it as psychosis (despite me saying it was how my flashbacks started).