Now don't get too cavalier! If your breathing gets worse, you'll have to weight the benefit of looking bad for the doctor with the risk of having a crisis. You do NOT want a crisis!

I have discussed this antibody thing with Dr. H. It's very rare, like you said, for someone to have an AChR antibody if they don't have MG. And when you have the clinical presentation of MG, plus positive tests and a response to Mestinon, it's hard to argue with that.