Twice had a reaction identical to the Guillain–Barré after the flu shot. First one was relatively mild so I did not care. Second time when it happened, came back to the doctor (almost couldn't drive because of the pain) and she told me that: "this could not be because of the flu shot, they are very safe. We know they are safe because we keep track of every incident occurring after the flu shot. Since the vaccine has been proven safe, I will not record your complaints as complications after the vaccine. Goodbye."