There is a recent study done that should be of interest to you:
What is PTSD?
[quote] Post-traumatic stress disorder is the term used to described the psychological effects of being involved in a traumatic event, such as a major car accident, a natural disaster, bullying, abuse or violent crime.
Many young people who experience very distressing events recover without experiencing PTSD - but some people do develop it.
Symptoms can include:
- Flashbacks and nightmares
Avoiding reliving the event
Anxiety, unable to relax