[jenandre]

you may want to look into finding someone who teaches alexander technique: http://www.alexandertechnique.com/

helps lots of musicians and others with repetitive injuries.

[jberryman]

I was going to suggest this as well. I found it was too difficult for me to apply it totally successfully to my playing, but studying it has been great for just everyday life and computer stuff where I tend to have a lot of unnecessary tension.