Be grateful your Pdoc won't diagnose you with bipolar if your manic episode was triggered by street drugs. And if that's the only time you are manic, I think she's right.

Since she doesn't know what's wrong with you, is there any reason to stay in therapy? I don't mean to be controversial, but if you don't absolutely need it, don't have it. So many therapists treat their patients like they [the therapist] should have the final say-so in how the patient lives his life. It can become a huge crutch.