Seek treatment/healing for RSI. I've just come through the other side of this problem, which was caused by my work as a library assistant. Please don't play through the pain. I had to wear a 'cock-up splint' for the best part of 3 months, and also had reiki and crystal healing. Gradually I've built myself back up, working first for 5 mins at a time without the splint, until now I'm back to a full shift. Patience is something that this has developed with me.

Jay