I was diagnosed with BPD when I was eighteen years old, by a psychiatrist I only saw once. I ignored it and continued trying to work on just my depression.

Fast forward to age 43 and a therapist whom I had been seeing for four months and whom I trusted also diagnosed me with BPD.

I was devastated to think that I'd been trying to run away from that diagnosis for 25 years and it was still there. My depression had not improved in the past 25 years and in fact it was worse. So I decided I had to address the BPD head on.

I did a lot of hard work and I still met several criteria for BPD but I have a much better grasp on my life and I'm not held hostage by my emotions any longer. It was definitely worth the work for me and my depression has improved considerably as well.

It is a stigmatized diagnosis but it sounds like your T is willing to continue to work with you despite the diagnosis. Take advantage of that and keep moving forward.