I think having mood swings, to some extent, can be 'normal' and not constitute BP episodes. Everyone has ups and downs. But it sounds like you're currently depressed and I hope you feel better soon.

If you have a combination of BP and BPD (and I don't know if you do), then I'm assuming that, if the BPD is active, there must be a hell on earth combination of severe mood swings due to almost daily situational issues and BP episodes, maybe only occasional, as well.