Have you seen a doctor and were diagnosed with it? I ask because I have RSI(repetitive stress/strain injury) and it affects me terribly if I do too much of anything with the hands(video games, pinball, golf, programming, fixing pins etc). Rest and moderation are by far the best thing for me. Take breaks. Stretch and be active. I also change hobbies and try to stick to one or two at a time. If it's summer I'm playing golf and not too much pinball and no video games. Sometimes weeks go by and I barely play my pins. Posture plays a role. Right now I'm trying to exercise and strengthen because that seems to help. I notice that after a round of golf I feel better the next day or two after the initial soreness has worn off. I think you are already on the right track. Good luck!