Is it possible to ONLY have BPD?

You know how when you go to a new doctor or to urgent care/hospital they ask you what things you've been diagnosed with already? They never seem to give me enough space to write everything! LOL

It made me wonder if it was possible for someone to only be diagnosed with BPD. When I was diagnosed (yeeears ago) my shrink said, "Sorry, no medications for BPD. We treat BPD with therapy, and depression/anxiety/ADD/OCD with meds." So that's what I've been doing, and it's mostly successful. 

