By Kevin J. Kelly
Special to The SUN
In the first article, we learned that post-traumatic stress disorder (PTSD) is a mental health problem that some people develop after experiencing or witnessing a life-threatening event such as combat, a natural disaster, a car accident or sexual assault. It’s normal to have upsetting memories, trouble sleeping and feeling tense after such an event. If these problems last longer than a few months, you may be experiencing PTSD.