Good morning Shari. Everything you listed is what I experience every day. I have had Myasthenia Gravis (MG) since 2000. I had all the standard type of tests you had, which showed nothing. What confirmed my diagnosis was a single-fiber EMG in 2002. I am not a doctor or an expert regarding this medical condition, but, if I were you, I would get the single-fiber EMG. Sure it was uncomfortable, but now I have a diagnosis. And with a proper diagnosis you can get better care.

Best of luck. Keep me posted.