Hi Maurice
I live in Brazil and I'm going to Maine, US. The difference between the temperatures will be strong and my concern is about this. I want to be prepared. Since I'm used to the new temperatures, I think (and hope!) I will be fine.
During the hot days here I feel worst than during the cold days. I feel better when I'm in cold water too. My first symptoms of MG were arm and leg weakness. Today, besides that, I have phonal and swallowing difficulties, double vision etc I'm still having new things that I'm not used to and I think this is why I'm concerned about the travel.
Have you ever read or heard about abrupt temperature changes?
Helena