First of all,a few things.

1) You used the world "impulse", before mentioning your therapist doesn't know what you have. I suggest you to not self-diagnose and ask her referral to a psychiatrist. Since it is beyond her level of competency.
2) Your list of actions do not seem to be fall straight into one category.

But we are here to help.

First of all, do not ACT the way you want to act. Since your therapist mentioned she cannot help you, I suggest you to really visit a psychiatrist.


"Is this OCD?"
We cannot know from the info you provided nor is everyone in this forum able to diagnose you (this includes me as well, I am a science student but by no means a mental health professional or a doctor) and the actual, reliable criteria to diagnose OCD is on
this website.

"What is going on"
To me, it seems that as a result of your sexual abuse, you seem to have some kind of psychological trauma in your mind.
"Strep throat can cause OCD in children"
Strep thought itself causing a neurological condition? I doubt it. I had them too while I was a child but perhaps due to other complications I don't have OCD. The sexual abuse you witnessed as a child is more likely the actual perpetrator. But don't visit the therapist as she told you it's beyond her. Visit a psychiatrist instead and follow his recommendations.