I am positive that I have BPD but when i mentioned it to my psychiatrist, she kinda shrugged it off as something to keep an eye on maybe. Of course I've only seen her a few times but I wasn't very happy with her passivity on the subject.
I am on Lithium 300mg twice a day for Bipolar and I think it has helped the mood swings quite a bit. Not sure if it helps with BPD or not though.