First of all, I'd like to smack your H silly for his behavior when you finally made yourself that vulnerable to confide in him that way. I don't know what his past is like but if he's never been abused he has no idea what courage it took for you to tell him something that intensely personal.
What type of counseling have you tried in order to deal with with the abuse you received? Has it been the same counselor or a variety of them? Have you tried Hypnosis yet? I understand it's hard to get to the root cause...but why do you think pin pointing the root cause is really so difficult...I mean, I know you were young...so you may have blocked several things out....the fact is the memories are still there to be accessed. Which is a horrifying thought, no one wants to re live abusive situations but sometimes it is necessary in order to face whatever it is you're fearful of. FYI...my first husband was horribly abusive (fortunately I was not a child) so to some level I can relate to you, but I'm sure not to the depth you experienced.
Tell us what you are comfortable with...we're all here to help