Carpal Tunnel

Is it possible to get carpal tunnel from changing diapers? I have this terrible pain in my left hand when I hold up my kids legs when I am changing them.  I have been changing diapers almost everyday since December 2007.   I would say in that time there were maybe two full weeks where I didn't.  Days when I didn't have the kids.  And my diapering days are not over yet.  I say I still have another good two years to change diapers.  It has really started to get bad here lately.  The older one who is in diapers, likes to move around and try to grab himself while I'm changing him.  So I find myself holding his legs and his arms at the same time.  And the little one just discovered how her body can move and it takes all that I have to keep her from rolling over while changing her.  All I know is that the lower part of my thumb is killing me and I'm not sure if I can put up with this for another two years.  I know, I know, go see the doctor about it.  I've got that planned, but wanted to know if any other mothers have experienced this problem.