Whoa. Lots of red flags here.

First of all, if your therapist does not have a license to prescribe medication, she should NOT be giving you medical advice. That is not her area of expertise and she should stay out of it. I also think it's against her license to do that (if she is indeed not allowed to prescribe medication). She could lose her job because of her medical advice, and she should.

Second of all, I would put aside the diagnosis doubting for a second. If you're doing well on your current medication cocktail and it's helping, then don't worry about people's doubts. But I do want to know: did anyone explain why they doubt your diagnosis?