I'm not a huge Billy McLaughlin fan, but I ran into this today (this may be really old news).
I've been hearing quite a bit about focal dystonica lately...Taylor Guitars has recently been writing articles about it. As a guitar player, I couldn't imagine this happening.
Regardless, there are some videos on his website http://www.billymacmusic.com/ about his problem and his eventual comeback.
Pretty impressive to be able to re-learn guitar playing left handed.
Check him out. I know there are board members who are big fans of his. I just never really got into his style of music...but he's one of the greats for sure.