Post traumatic Stress Disorder (PTSD)

Post on the discussion board a description of someone you know or someone you know about who has developed PTSD as a result of exposure to a severe traumatic experience. What is that person going through as a result of their PTSD? Please do not identify the specific person; just discuss the situation that caused their PTSD and the impact it has had on their lives. If you do not know of anyone with PTSD, write your post based on your readings and research that describes how someone with PTSD typically reacts and behaves as a result of the condition. Have you found in your studies if there are effective ways to prevent PTSD up front or mitigate its effects following a trauma?