I want to break up with my therapist. I feel that I'm not getting anything out of therapy, and that it's a waste of my time and money.

It's not my therapist's fault. He does what he should do. But, nearly all my problems revolve around bipolar depression, and no matter what he says or does, there's nothing that can help me overcome depression except medication. It's just the nature of the beast.

What is the best way to end it all? If you've broken up with a therapist before, how did you do it? I want to be respectful and professional.