I think it's overlapping all Over the place when it comes to bipolar and BPD. There are so many similarities that it is hard to decipher what symptom goes with what disorder. I had good Bpd diagnosis until last week when my doctor told me she had officially removed it. I have been tracking my moods three times a day for a long time and she's been studying them and keeping watch over my symptoms etc. and I meet the criteria for very rapid cycling bipolar one but not Bpd. It's a really difficult thing they're even experience doctors to figure out. Just my opinion