Every Duel you missed

Ten days after surviving a highway collision in which another driver died, a 34-year-old man reports intrusive memories, nightmares, and episodes of acting as if the crash were happening again, along with feeling that the world seems unreal and being unable to recall the moments right after impact. He avoids thinking about the event and refuses to ride in cars, sleeps poorly, startles at any horn, and constantly scans traffic, which has kept him from returning to work.