Hi Liz,
your RSI needn't be it could be Carpal Tunnel Syndrome as mine is, if you see what i mean. CTS is a pain in the arm (why do you think I'm called grumpy?) so to speak and can also cause odd pains to crop up elseware. I have found I can keep the symptoms under control by being careful with what I eat, my main cause of problems is dairy food. Hope this may be of some help
Grumpy