Why did you choose the avatar you chose?

I think purely from reading about the issues you describe that you probably have some borderline traits (indeed). It seems you don't find healthy expression of your emotions/problems. Everyone has that, but some know it and express their unease which aggravates the situation, in a cyclic way. Relationships, if strong enough, are not a problem (initial problems might've actually made them stronger than those of most).

But it doesn't require a diagnosis to deal with that.

As you said an antipsychotic helped you, you might try that again just to figure out whether any anxiety is caused by some "background" delusional thinking.

I'd suggest not taking any anxiolytics or antidepressants as long as you don't know the exact cause of your anxiety. You might need their full efficacy (the eventually and gradually lose efficacy) when you actually have a plan to eradicate your anxiety (which is possible).

Don't care too much about labels: BP-2, borderline and anxiety are all aspects of the same. Borderline may be more pronounced in your case than in most (some may have none of it), maybe not, but I'd suggest you just go for the "full" treatment and see what helps and what doesn't (takes at least months!).

Edit:
Days of emotions of depression or elation is not uncommon. I very much relate (also with the good relationships/friendships with others that are not or no longer toxic).

However, more intense borderline traits may be somewhat more common in BP-I or SZ (and related disorders/disorganisation). It may just mean you put a brake on so early you don't have longer and more psychotic mania, so you are always just a bit in a mixed state (which is what I suspect based on many of your posts, though I could be wrong).

Been there, done that, bought T-shirt: "Beware of reactivity!".