I too have the same symptoms but with rather bad dysphagia and hands drop things and had 3 attacks of acute weakness that over 1-3 hours of use led to paralysis . I'm neg for mg antibodies. I'm on mestinon which fixes the dysphagia . I also have had racing heart for months lack of ability to sweat dry eyes mouth and nose and dizzy when I stand up . Neuro says its some sort of myasthenic type condition.