I hope you find some answers. I often feel the same: I'm doing everything right, I have this great job, flat, boyfriend, pay my taxes, donate money to charities, why can't I be happy and content? I'm beginning to suspect *everyone* feels the same to some extent. I don't know if that is comforting or even more depressing.
Now I've probably succeeded in depressing you even more :-( Sorry. Here, take some virtual {{{hugs}}}