Wrist rest for MacBook

Hi

After 18 months using my MacBook, I'm now suffering from mild tendonitis in my right wrist when I use the track pad. Has anyone discovered any product or alternative way of working which will allow be to continue using my MB without suffering severe hand pain? I've already tried a gel wrist rest but it's completely useless as it's not soft enough.

Thanks in advance

Bob

PS: Ouch!