I was misdiagnosed with bipolar because of my borderline PD related mood swings. It's gotten sorted out now, but I can really relate to this frustration with being misdiagnosed. I don't have much advice, but I'm sorry you're going through this and I hope you can get it sorted out soon. It's hard to find pdocs that are willing to discuss personality disorders, most of them just don't want to deal with it... borderlines in particular are very challenging to treat and a lot of professionals refuse to see it because they don't want to have to treat someone for that, or alternatively they aren't competent enough to treat borderlines.

I hope you can get the right diagnosis, and the right treatment. You deserve real help.