Oh, man, I am always frustrated with those fatigability exams! My neuro never tests long enough either. I explain every time that my initial strength is normal.

It is pretty common to test negative for the antibodies. Sometimes they come out later. Sometimes people have another antibody besides AChR and MuSK.

People with symptoms like yours who test negative for antibodies should have a single-fiber EMG. That's how I was diagnosed.

A lot of people here have found it helpful to see a neuro-ophthalmologist.

Abby