That's what I thought, that arm weakness was a symptom and she couldn't have been confused by how I described it... She never even gave me the chance before brushing it off and saying she doesn't like everything being put down to MG. She did say though with the abnormal sfemg that it doesn't matter if my MuSK antibody is negative, that I still have MG, I will just be double negative.
Thanks for your replies.
Meech.