@26m John explains that it's really hard to get a diagnosis for the actual problem. You'll get all kinds of advice on the web where people will tell you to go to a doctor. Unfortunately, it's really hard for a doctor to determine the source of the problem.
About a minute later he explains how the problem might not even be in your hands, it could be in your shoulder, for example, but you might feel the pain in your hands.
He recently discussed RSI in length in an episode of the Pragmatic podcast: http://techdistortion.com/podcasts/pragmatic/episode-50-acci...