I understand what you mean by saying "mild" sexual abuse. But sweetie, it's no less devestating to be molested or "not raped" It's still someone with more power doing something to make you feel helpless and not in control of yourself.
You know, when I was in fifth grade, a boy held me down on the back of the bus to feel me all over. Even though it was a kid my age, I was mortified and afraid. I've always thought of that as mild, but it's impact with everything else going on around me was big.
Your symptoms may very well be ptsd.
Marrisa