Originally posted by: johnjohn320
I don't claim to be a doctor, but ever since being diagnosed with tendonitis in my left hand (I'm a pianist), I've been researching a lot on this and talking to lots of specialists. I'll try to apply similar logic to your problem:
I highly doubt strengthening muscles in your arm/wrist will do anything to get rid of the pain. Depressing a key on the keyboard (or clicking a mouse or whatever) requires very little muscular effort, right? It'd be like saying "the steering wheel won't turn in my car, so I'm just gonna push the gas pedal a little harder to give it more power."
Just as I am having to re-approach my piano technique, I think you'll have to figure out how to make the movements at your keyboard such that they won't be injurious. Strength is not the issue-you don't even have any muscles in your fingers, only tendons connected to muscles in the forearm.
In the meantime, pop some ibuprofen and REST IT. I'm not judging you here, only saying as a fellow repetitive stress syndrome sufferer that it will NEVER heal as long as you keep aggravating it. Don't even try to return to gaming until you don't feel any pain anymore. Nip it in the bud before it becomes a debilitating issue.