Kim, get yourself a GOOD keyboard tray... one that articulates up and down and sits on a NEGATIVE TILT (where the keys slant gown towards the desk instead of towards you (I don't know who put those little feet on the bottom of a keyboard to tilt the keyboard up in the back and low in the front - that cause more pressure!)

Here's one I used to use in my office. They ain't cheap my dear but a whole lot cheaper than medical expenses. The site also has some good info on ergonomics.
keyboard trays