[ Hi, this is me trying my best with what my poor brain can get from Wiki ;_; ...please uh... I hope it's okay. DX ]

While I am no psychiatrist, I suppose I can assume your friend is suffering from Post Traumatic Stress Disorder. It would be careless of me to diagnose from hearsay alone, of course. There are medications-- Ah, let me rephrase that. In my world, medication for which some symptoms of that can be helped with exist. Those medications must exist here as well.

But...