Post Draumatic Disorder

PTSD is an anxiety disorder that made up of flashbacks, nightmares, and other symptoms that impair an individual’s everyday functioning. This disorder is widespread; in the U.S. there is about 8% of the population affected with it. PSTD is not only one of the best known psychological disorder but also one of the most controversial because the significance of trauma have come into questions many times with psychologists. 

 http://www.scientificamerican.com/article.cfm?id=when-coping-fails