I hope her going to see the psychiatrist (or is she going to a psychologist?) Will answer a few questions for you. If she is dx'd BP, she can start on meds and ideally should go to therapy. It wouldn't be couples therapy, and it should be a lot easier for her to eventually open up if it's just her and the therapist.
As she gets a hold of her dx and symptoms, you'll realise things between you will get better.

I'm sure she also has a lot to work through from her childhood.
I know it's hard right now, but just getting her to seek help is a HUGE step forwards.
Hang in there, and check in with us whenever you need to, ok?