Be honest and open with your T.

For the record, a lot of Ts won't tell a patient if they think they have it if it is not good for treatment because of the stigma. If you bring it up, maybe you'll find out if you do or don't.

For the record, I wouldn't self diagnose, but if you are suffering from symptoms of BPD, I'd recommend addressing those in your own time. Reach the web, buy books, practice mindfulness.

Good luck!