Is derma changing my mood?

I've had dermatillomania for roughly 4 years now, im 15. Recently i've been becoming more depressed a lot of the time compared to usual. The pressure of exams and things aren't helping. I can be incredibly happy one minute and an absolute depressing mess the next. Im not as hyper and funny as i used to be, it's as though im a different person now, everything just get's to me, even the smallest of things that don't really matter! I just wondered if derma and depression were linked and any ideas on how to stop? Also i think i have anxiety because now i suffer from anxiety attacks every so often, is this related too? If i stopped picking would it make my anxiety and depressive mood better?? Much thanks before hand, Cerys:)