The guy that I go to see for my mental illness is actually a psychiatric nurse practitioner. For me, he fills the role of both psychiatrist and psychologist. I have regular therapy sessions with him and he prescribes my medications as well. He works out of a local clinic in my town, but he essentially runs his own business.

Obviously, you would looking at a master's degree and some licensing requirements if you did go that route, but you would be in more of a General Practice atmosphere rather than critical care.

Hope that helps!