Do you suspect that you have other undiagnosed disorders?
I've always suspected BPD, even before my bipolar diagnosis. I seem to fit a lot of the criteria. I've just never brought it up with my pdoc because I'm rapid cycling and my moods have been all over the place! I need to get stable first.
I used to suspect Asperger's (before I got my bipolar diagnosis), but I did a full neuropsych eval and I just have an avoidant personality, bipolar, OCD, and ADHD. Together, those 4 kind of mimic the symptoms Asperger's.