Elanor, Usually when asthma is worse, it can feel like your lungs are restricted too. Do you have wheezing that accompanies it? One way you can tell is if you are better on Mestinon and worse off of it or if you are better if you rest. If your breathing is getting bad, you have to call your neuro, pulmonologist or go straight to the ER. You can't always tell how bad the weakness will get, because MG can tank quickly if you are on your way to an MG crisis. The best place to be is with doctors!

You can get "sudden" shortness of breath episodes with MG. With asthma, it usually will only get better if you take an inhaler like Albuterol or MaxAir. I have asthma too and have some triggers that I am aware of. It doesn't hurt for me to take a puff of my rescue inhaler to see if it's the asthma or the MG.

You really need a doctor, or two, to advise you on all of this. I hope you will feel better soon.

Annie