Hmm, this I admit is purely speculative, but my adoptive dad was bipolar. Not sure if type 1 or 2, but he collapsed one night several years ago and had a seizure, got taken to hospital and was talking really strangely to my mum on the phone from there the next day, before we picked him up. I can’t remember exactly, but I think that was just before the only really obvious hypomanic episode I witnessed, which led to him being sectioned for a few weeks.
I didn’t actually know he was bipolar until after he died - it wasn’t discussed, but I knew there was *something* going on with him.
I’m not bipolar myself, but reading these posts is still helpful for me, to help make sense of things that have happened.