I'm sorry to read this, you've been having such a hard time of it lately.
I don't understand why your therapist would have to report your self harm? If you haven't threatened to kill anyone or indicated you have a plan for yourself with specifics they must keep your info confidential.
I really believe you need to share the abuse, its been rearing its ugly head on you for a while and even sharing the fact that it happened will lift some weight off of you. Just to get it out there. You don't need to deal with specifics or rush yourself. You can do all of that later when you get through this patch.
For your therapist to help and understand, just share the minimum, state you were abused and leave it at that.
I'm so sorry. Please do your best to look after yourself, I know you are trying so hard right now.
:console:
edit to add that I couldn't verbalize what I wanted to say. I didn't want to say it either way but I knew I should. So I typed out a couple of lines with the minimum and handed it over. It was the hardest thing I have ever done, I never told a soul my whole life. And you know with whats going on now I just can't deal with anything else, so its been put on the back burner which is good. I also did the same for adult abuse stuff. I can't go there either but sometimes these things rear up, so now so I can mention that "this" and "this" were on my mind or triggered etc. Its hard, I understand.