Goddamm shoulder muscle hurting

I've been spending the weekend and right now doing my college work, ITS P*&@ING ME OFF SINCE MY SHOULDER MUSCLE ALWAYS STARTS HURTING SINCE THE POSITION I'M FOR TYPING IN LONG PERIODS OF TIME MAKE MY SHOULDER MUSCLE HURT. AHAHAHAHAHAHAH.

Ok another of being 'ANNOYED' :P , I really hope when I give in the work I won't have to do it again. But , if I have to well ; what can I do? however I will complain and ask why I got to do it again

anyways its 9:14pm goodnight