Capricorn, therapy is the preferred choice of tx for PD's - I am borderline and see a therapist (I am also bipolar) and take meds. Did someone tell you that you are not suitable for therapy, like your psychiatrist? Is your insurance refusing to pay for therapy? I've never heard of criteria for being suitable or not suitable. There are many different types of therapy - cognitive, DBT, EMDR, etc - and each therapist works with his/her client with whatever method works best for them.
Also, why the antidepressant - do you also suffer from depression? Please post again - I'm not sure from your information exactly what you're asking.