Last year I woke up with a half closed right eye and a right facial droop. I was seeing double and it was painful to move my eye from left to right and right to left. I was told I had myasthenia gravis. Apparently I had all the clinical symptoms however the blood work was negative. The doctor put me on mestonon and it tore up my stomach so I stopped it since the blood work came back negative. I do expetience muscle weakness and I am always exhausted my question is......if the bloodwork is negative could I have MG?
Not all patients of MG have positive antibody testing. If there is clinical response to pyridostigmine then it's an indirect evidence of MG.  You continue medications. Do following work up .....RNST rapid and slow CT thorax for thymus evaluationTSHICE test Hope my answer will help you.  Take care. Don't forget to rate me.