Ask YC: What to do with repetitive strain injury problems? 18 years ago
I encountered similar problems and found that Kinesis Advantage Keyboard is a lifesaver. See it at: http://www.kinesis-ergo.com/.
If you are not use to typing on a split keyboard, I would switch to that first, and than to the Kinesis as it can take a few days to get use to. I also use a Logitech Wireless keyboard for gaming purposes, and due to numerous people trying to do a quick google search on my computer and spending half an hour trying to figure out the keyboard.
It's a bit expensive, although you can pick up a slightly used one on ebay for less (that's what I did). However if you think of the amount of time you spend typing and the fact that it is your career $300 is nothing.