Hi Arthur.

About two years ago I tore two of the rotator cuff muscles/tendons in my right shoulder and had to temporarily learn how to do a number of things left handed to allow it to heal. I tore my cuff due to years of overuse and strain. I did go to a doctor, but I also got a book called, "The 7-minute rotator cuff solution" which has helped me build back up the strength and eliminate quite a bit of the pain in my right shoulder, allowing me to do alot of activities right handed again.

I'm not sure if this is your case, but I highly recommend this book as rotator cuff injuries are actually very common due to overuse. It is a very neglected muscle group which leads to many injuries. The book is hard to find, as I've heard it is out of print, and many places sell it for overly high prices. But I did find one site that is selling it for $20:

http://www.crainsmuscleworld.com/booksmedicine.html

Take care and I hope your shoulder gets better.