Hi Sazzy
If the pain is just in hands and fingers, it may not necessarily be RSI, chinese herbal medicine and acupuncture can often help, they are good at helping unexplained problems. The hospital up from Hollywood Rd, I think its called Tung Wah, but not quite sure if thats the right name, anyway they do this service and have good reputation.
This may not make sense but if you are getting sensitive/allergic to pollution, etc in HK it may show in your hands, reffered from the Spleen, also consuming to much sugar can do this. There are many reasons why this could be happening, they are just guesses based on my experiences
Homeopathics may also help.