I have had all kinds of arm/shoulder/wrist/neck problems. My experience is that regular exercise somehow makes the pain go away.

You don't have to go overboard, but doing something like weightlifting twice a week would be a big help. Keep it light. Your only goal in this kind of exercise is to be consistent about showing up every week. If you don't like weightlifting, yoga is good.

By the way, some of you know I had some real difficult carpal tunnel trouble recently. I found this split keyboard has made a huge difference:

http://www.safecomputing.com/goldtouch_split.html

Now I can play guitar for more than 10 minutes again!

Good luck, hope this info helps.