Years after he barely survived a terrorist attack that killed his wife and two children, mr. puskari suffers recurring flashbacks and frequent nightmares of the event that render him incapable of holding a steady job. mr. puskari is most clearly showing signs of

Post Traumatic Stress Disorder (PTSD)

Explanation:

Post traumatic stress disorder is an anxiety disorder triggered by traumatic events, like the loss of a loved one, sexual assault, aggressive incidents. PTSD is characterized by the inability of a person to recover after experiencing or witnessing a terrifying event, individuals experiencing usually presents with symptoms like flashbacks or nightmares, anxiety, depressed mood.