I have BP I , a few years ago an IP Pdoc labelled me BPD ...

Him and I didn't get along at all , so I think he did it outta spite. (whatever)
My Pdoc and T didn't agree, they felt that altho I do have some traits of BPD, that it could or could not be realistic in my case so they dismissed the diagnosis based on how I managed to cope with day to day life and relationships.
BPD is treated mostly with DBT therapy, not much help with medications in "general." DBT is actually helpful for BP too.
We all have our own unique verison/soup of Bipolar so to speak.
If my Pdoc slapped a label on my unique version I would be BP I, Anxiety,Panic disorder, Ptsd, Ocd, Psychosis, Poor impulse control and just for kicks DID. My Pdoc uses the umbrella approach.. Unless I went full blown out of my mind on any particular one then he would consider a specific new label.
Every Pdoc has there own views on diagnosing.
My advice focus on treatment plans as opposed to getting hung up on a label. Yeah It's hard and scarey at times
Take care