I had to play left handed some time ago and I used a slick flicker as I seemed to have good control of the puck with it. However, I had the same problem with a sore hand and wrist. I overcame this by padding teh handle out with some neoprene and trusty electrical tape. The pain dissappeared almost straight away. This same problem is experienced in other sports too, such as squash and tennis. Often a change in grip size will overcome or create a problem.