Something happens to my father sometimes during drinking liquid or laughing. He becomes suddenly red and unconscious even his breath stops. We have to push his heart hardly and sprinkle water to bring his breath again and make him conscious. He has visited many cario and neuro specialist but all in vain. Reports were normal. They said that they can only judge if they see live situation. This rarely happens. Only while drinking or laughing. It has happened 8-10 times in his life. What should he do?