Symptoms of  PTSD may include flashbacks, nightmares, hyper-vigilance or alternatively feelings of numbness and flatness, a tendency to be easily startled, insomnia or sleeping too much, irritability, memory and concentration difficulty, anxiety and/or panic attacks, lack of trust, avoidance of people and situations associated with the traumatic event, and dissociation (the experience of feeling disconnected from oneself and the world around).