PTSD

PTSD is a severe anxiety disorder that can develop after exposure to any event that results in psychological trauma, such as the threat of death to oneself or to someone else, or to one's own or someone else's physical, sexual, or psychological integrity, overwhelming the individual's ability to cope. 

As an effect psychological trauma, PTSD is less frequent and more enduring than the more commonly seen post traumatic stress known as acute stress response. Diagnostic symptoms for PTSD include re-experiencing the original trauma through flashbacks or nightmares, avoidance of stimuli associated with the trauma, and increased arousal such as difficulty falling or staying asleep or anger.

Formal diagnostic criteria require that the symptoms last more than one month and cause significant impairment in social, occupational, or other important areas                                  of functioning.

There are three treatments that could help to reduce PTSD symptoms. 

First is with a Good Social Support System.

Second is with Eye Movement Desensitization And Reprocessing which could help to reduce symptoms of PTSD by changed how you react to memories of your trauma by encouraging you to remember the traumatic event and express your feelings and when you feel frighten, in this therapy you'll focus on other stimuli like eye movements, hand taps, and sounds. For example, your therapist will move his or her hand near your face, and you'll follow this movement with your eyes. Over time, memories of the event should become less frightening for you. Despite of studies that shown that it may help you have fewer PTSD symptoms, research also suggests that the eye movements are not a necessary part of the treatment.

Third one is with antidepressants that include selective serotonin reuptake inhibitors that act on the nervous system can help reduce anxiety and other symptons of PTSD.