Hi Alan,
I agree with the others - yep it's probably MG. I haven't had any massive problems with my breathing, but a couple of times when I was exerting myself walking quickly I lost my breath. After calming myself and relaxing for a few seconds it came back. I was panicked the first time it happened because I was alone but once I calmed down everything was fine. I agree with Erin though - you should probably try to take it easy until you get your medications sorted out. I keep saying the samething to my Dad - he was diagnosed a year ago with MS and he is still shovelling his drive and the "elderly neighbour's" too (he doesn't realise that he is now an elderly neighbour himself). Ha ha!

Take care of yourself and enjoy the holidays!
~Kathy