Has he seen a therapist? Maybe they could help get to the bottom of the mood swings since you said there seem to be triggers. And there are therapies that could maybe help with what you describe depending on the cause, such as DBT. From what you are saying bipolar does not jump out at me, but I am not really qualified to say one way or another. Did the mood swings get worse since the Lexapro/Adderall? I will say both of those made me quite irritable and the lexapro put me in a mixed episode. Maybe you could also look into therapy for yourself or couples therapy, too. I am sure this is tough for you.