Any muscle, back and joint pain should first be met with mild strengthening, mild weight loss and mild exercise. It's like turning your computer off and on. Mostly the problems go away. Then check for other things :) Keep remembering to relax and move, from your fingers to your wrists and shoulders. And keep trying different set-ups and equipment if you can. There is a pretty magic set-up for most people. 30+ years myself into being on a computer nearly all the time personally and professionally. Back is starting to hurt again. Time to take my own advice again :)