Hi Barbara, I sure don't claim to be an expert on MG but from what I have read and my own experiences it seems to be a very unpredictable disease. Stress, type of work, and age perhaps all seem to influence it as well. I was only dx about 3 months ago so still trying to figure out whats the game plan. I take 60mg of mestinon 3x a day and not sure how much it really helps. I don't have the shakes or tremors as bad as I did so that's a positive - however I have spells almost ea day of fatigue and shortness of breath - so far its manageable but some days its a challenge to do my job well. Thankfully I can sit back for a few minutes occasionally when I need to and rest for 15 min or so...
Took a 20 min walk after work today for an example and had gone only about 3 or 4 minutes and a sudden weakness hit me feeling like my legs were getting very weak - I pushed on and made the 20 minutes but it was determination that pushed me on. Excersice can leave you weaker but I don't think it really does any harm and hopefully helps a bit with weight mgmt and muscle strength even thought you may feel tired..?
How long have you known you have MG?
Randy