oh and another tip i have is to download this program
http://www.rsiguard.com/
it clicks for u, so if u point the mouse at something for more than a split second it clicks it for you, u can also program so it will click super fast, like less than a 10th of a sec or slower... whatever u want..
i think its the clicking motion of the mouse that aggravates the wrist
at first the program will be annoying cause it randomly will click shit if u move around the mouse in certain way but once u get used to it, it helps a lot! try it!