I've had trouble like that for years. I thought it was Carpal but turned out to be RSI. I did a course of physiotherapy which helped a lot.
Anyway, I use this mouse:
http://www.keytools.co.uk/airobic-mo...ill-mouse.html
I have a mouse like the one you showed but I find the DPI too low - I have to move it too much.
The best thing I found was to use 2 mice. One hand for movement, the other for the clicks. It seems the combination of movement and clicks on one hand causes the trouble.