I've been wondering about this too. I have one manager who knows I struggle with panic attacks and has been very understanding. Neither one knows about the bipolar disorder as far as I know, but it has been starting to affect my performance lately. I was leaning towards not saying anything (the understanding one is currently away on maternity leave) and I think I'm glad I haven't yet. I have one coworker who knows and I only told her because her son is also bipolar so I knew she'd be understanding. I'm just hoping things get straightened out before I no longer have a choice.