How about what you enjoy doing? I would hate being a computer programmer but I love…. (my profession). But computers you can do from home, part time, get good money etc. But if you are unhappy with it you will not be doing anyone a favor! Imagine a doctor who doesn’t like blood?
A good idea is volunteering in the dept. you would like to work in, or shadow a nurse. You can’t really shadow a psychologist but you can talk to one to find out about the profession (privacy rules and would you want to talk to a psychologist with someone watching you?).
Maybe take a class in each field- do you like biology? psychology?
Do what you want, not what sounds good or random people who may not know anything about a field comment.