I won't confirm or deny the scratching aspect, as it would be rare. People respond in different ways. Yes, drugs can stop a females period. Every person responds differently. Could someone begin scratching themselves? Maybe... those with anxiety of this level take up cutting themselves, so anything is possible. They also cut to make the pain from trauma to away, or more to make themselves feel numb due to the trauma and anxiety at a given point.

I wouldn't say your off topic, though I wouldn't say it fits the mould of PTSD attributes either. Either way though, still a good aspect. It is a book after all, not real life.