I had RSI in my right hand a few years ago and thought it was caused by using a mouse so I switched mouse hands.
At first I would swop the mouse buttons to be a lefthanded mouse and use it with my left hand. (i.e you click with your left index finger, and 'right' click with your lefthand middle finger). It took a bit of practise of coordination to be able to click exactly where I wanted on the screen.
However sometimes I would pick up my lefthanded mouse with my right hand, not switch the buttons back and use it with the lefthanded buttons but with my right hand.
After a while I could pick up any mouse with either hand, whether the buttons had been swopped over or not and after a couple of clicks use it very comfortably.
So try this exercise out for size:
- Use the mouse with your left hand, with the buttons swopped to make them lefthanded.
- Use the mouse with your left hand, with the buttons unswopped to make them righthanded.
- Use the mouse with your right hand, with the buttons unswopped to make them righthanded (if you are righthanded you already do this!)
- Use the mouse with your right hand, with the buttons swopped to make them lefthanded.
let us know how you get on.