Wendy - so sorry to hear, but we do need to sometimes make decisions that are in favour of our health.
I've been in a VERY similar position so I can relate. The irony is that we were best friends, she was already dx bipolar and we assumed I was too. She now made the decision to cut all contact with me, as she felt her bipolar was getting the better of her, and that our friendship was becoming too much work, creating too much unrest and anxiety.

I do however find myself telling my p-doc I'm fine, then having to phone her the next day (Like last week) nearly ready to admit myself to hospital - the wheels have come off. I know they are meant to be professionals and understand, but sometimes I take a step back and look at myself and feel like a freak - one minute I'm 120%, then come crashing to rock bottom.