I was reading your post and thought this might be of help. My hubby started with 4 months of double vision and positive MG blood test. He was told by the neuro doc that mestinon really only works for the drooping eyelid. He had been successfully treated with CellCept for several years.. it took longer than prednisone to secure the single vision, but has less side effects. He also has weakness in the limbs, eetc.