Eh.. you don't roll anything and take a break from WoW before you seriously fuck up your hands and wrists for good from repetitive strain injury. 8|

If they are getting sore you really should just take a break and not be looking for something to make them less sore, there is no class you can play without hitting the keys and clicking
Get some wrist supports at least if you want to keep on playing.

I would go with hunter also, as it needs the least imput.