I was hit by a train and had no physical effects, but i have terrible dreams of the wreck. is this an illness? what to do?

Dreams: Speak to a psychologist or psychotherapist to help you. You are having nightmares as well as anxiety.

Having nightmares: About a traumatic event doesn't constitute a diagnosis. However, if you have additional symptoms - there is a possibility of an anxiety disorder or post traumatic stress disorder. Consider seeing a psychologist or a psychiatrist for a comprehensive evaluation ; to get help. Take care.

No: Traumatic injuries or events with major mental and physical imparts do lead to nightmares.

Train wreck trauma: Can leave you with nightmares and anxiety. If you are unable to get it behind you, consider seeing a psychiatrist who can evaluate you for post traumatic stress disorder.