In addition to a possible career transition from graphic design to writing, I have also considered going back to school for a degree in art therapy or clinical psychology. I have always been a good ear with sound advice for people needing someone to talk to, and don't reveal details of a conversation with that person to others. My background in the fine arts (I earned a bachelor's degree in art), art therapy seems like a natural transition in this area. However, I'm wondering about a more advanced degree in clinical psychology.

Aside from the additional time and expense of attending graduate school for art therapy or clinical psychology, how difficult would it be to make such a transition? Would it be worth the time and effort? Is there a huge demand for people in these careers?