It bothers me that psychologists are recommended but they only really work if you just need someone to talk to, otherwise they don't do anything for you at all.
I don't really know what to say here, I've felt similar numerous times, and as I've said before, am suicidal. However what I do recommend if it hasn't been done already is for a doctor to actually look at your brain (CAT scans or something) because there could be something physically wrong with your brain (eg. a tumor or something).