This is my first post. I have been extremely weak and resting for three months, like falling off a cliff after a very active life (46 athlete seven children). I tested positive (0.48) for AChR binding antibodies, but negative in the single fiber EMG test. The neurologists are definitive that I do not have mysasthenia gravis, but I am at a loss to explain my profound weakness. In two weeks, I have an appointment with rheumatology/immunology. This week I am also afflicted with inexplicable systemic hives (which might be autoimmune because I woke up with them before eating or drinking anything).

If it's not myasthenia gravis, what is it?
Becca