I'm reflecting more and more on this, and I think if you aren't textbook mood disorder or textbook BPD, the label you'll get depends on the professional you see and how far they are willing to stretch the mood disorder dx versus how far they want to stretch the personality disorder dx.

I have ultra-rapid cycling sometimes. Some clinicians think this is impossible in bipolar, others think that most bipolar patients go through periods of fast cycling at some point in their illness.

I avoid conflict like the plague because I'm afraid it will cause an irreparable break in the relationship. Not quite the same thing as abandonment fear, but some clinicians might think it is close enough.

I've calmed down now, and I really don't think I have BPD. I think I was so worked up (partly because I was in a mixed state!) that I convinced myself that I had a defective personality (due to the depressive symptoms) and I had the energy to obsess constantly over it (due to the manic symptoms).