Squirrel, your pdoc is already concerned about your a stability I think. Telling him about the mom situation will at least put your current functioning into context. I don't think it will make him more likely to admit you to IOP or send you to the hospital. Just my opinion though.

I'm sorry you're having to go through this. My parents both confided in me their feelings about the divorce and I was only seven at the time. It's rough.