Help diagnose my friends condition. He had it since age 13. He has been to doctors and they are clueless. In fact he has to main things that go on in his body. First of all I should explain he was a star track runner in school. He was always faster than most people. Since the age of 13 his muscles still work as before, but his body breaks down after running. He says the first ten seconds he still runs faster than most people and then he start losing loses his vision, and hearing. His joints go into a numbing pain. Even talking becomes too much for his body. His body just completely breaks down. Because he loves running so much he tried to get over this, but he had near death experiences. He also has low blood pressure for an unknown cause apart from this issue. He faints often. He said his head feels as if it got a concussion and then he feels the need to faint. Any ideas of what this might be so he can finally get answers from doctors and get treated.