Things that happened in our past often haunt us, in ways other people don't understand, i'm not sure what your particular flashbacks are caused by, but from my own interactions with victims of things like SA, who have flashbacks and such, i think that it must be one of the hardest things to deal with along with the memories... so to endure it at all you must already be strong, so stay strong. sorry to see another MA'er in pain.
* all apologies if i came off as a douche bag, i'm normally not one! >.< *