"very frequent and intense changes in mood, which can be a hallmark of BPD"

I didn't know that

I've always thought I was a rapid cycler, (even though I was originally diagnosed BP 1) because that happens with me where I can feel great one minute than totally switch... it's also usually an "outside" factor that "triggers" my switch, and then after a few hours I'm usually back to normal. Hmmmmm...