BPD might be difficult to deal with but there is no DSM or ICD-9 classification for "difficult" Borderline Personality Disorder.

I am afraid I have to detract from the psych nurse's opinion. You must be active in your own treatment. If you just agree with everything the pdoc and psych nurse say you will probably not get pleasing results.

Therapy is the kind of place vulnerable people should go. It provides a secure and trusting environment where you can share your thoughts and feelings with someone who has dedicated their lives to providing healing.

I think you should talk to your pdoc and ask for a referral. The therapist should preferably be skilled in providing therapy to clients with BPD as their are several specialized approaches that should benefit you the most.

Going to a therapist does not mean you have to stop visiting your pdoc. In fact most people choose to create a care team scenario in which each provider is utilized for their speciality. The therapist may provide you the support you need when you are feeling down, the psychiatrist may manage your medications and your primary doctor can help with medical problems.