I'm voting for RSI, so there seems to be some consensus on that. I'm generally a believer that the best medicine is the delivery of as much nothing as possible, and given that a doc is unlikely to be able to do much for it except maybe give you a stronger anti-inflamatory waiting probably isn't going to do a lot of harm.

You might wanna talk to a (sane) chiropractor, although I'm not totally sure how you pick the sane ones from the crazies. I believe there is some association of non-wingnut chiropractors--the ones who focus on empirical results and ignore wack-job theories--but have no idea what it's called.