Rsi
 

Do you do anything to prevent getting this ?

lots of vitamin C?

credit to http://www.worklink.net/prevent-rsi.html ...

Adjust your workstation properly. Make sure your monitor is directly in front of you, with the top-third of the screen at eye level. Be sure your keyboard and mouse are low enough to allow you to relax your shoulders.
Sit up straight with your feet flat on the floor. Make sure your chair supports your spine in an erect position.
Practice proper technique: never rest your wrists on the desk, wrist pad or armrests while you are typing or using a mouse or trackball.
Pace yourself. Take a 5-10 minute break every hour or less.
Get plenty of regular, vigorous exercise. (Swimming is great!)
Do appropriate upper-body strengthening exercises.
Stretch frequently while at the computer.
Do not work at the computer if you are experiencing pain, fatigue or soreness.
Avoid using the mouse and trackball whenever possible. Use keystrokes instead (or voice recognition).
Cut down on your computer use: leave voicemail instead of sending e-mail. Go for a walk or see a movie instead of playing video games. Look something up in a book instead of searching the Web. You could be in the danger zone for injury if you use the computer for as little as two hours a day.
Use voice recognition software for text or numeric entry at least part of the time to give a rest to your hands, arms, shoulders, neck, etc.

Are you really doing that? I know many exercises and recommendations, but never do the ones which cost time, OR don't think about it. Buying a good keyboard is no problem, but doing things which cost time is another story. I only do this when I feel pain in my fingers, but then it's already a bit late.....