I had my single fibre emg yesterday after it had to be rebooked because of the doctor. After the test she said she noticed some eye drooping. My Acetylcholine Receptor Antibody came back negative so she is filling paperwork for other antibody testing which needs approval from my province (Ontario) because it needs to be shipped out of province to be tested. I'm guessing this may be musk antibody? Would the doctor have an idea of results as she is doing the sfemg? She gave me a prescription for mestinon to take every 4 hours ( I haven't started yet) I am just going to do some shopping and pick it up. How bad should I expect the side effects to be? I already have stomach issues and am pancreatic insufficient.