Emotionally numb, detached, and easily startled behavior is common. Some people have trouble concentrating, depression, and sleep difficulties. Scientists are not exactly sure what causes this disorder. Some people experience trauma and are able to work through on their own, while others become quite stricken by it. It is thought that these individuals are unable to handle the event and their reactions to it.
Some people naturally find it easier to express themselves than others.
Sometimes, in a case like this, emotion MUST be expressed. It seems as if it finds a way, even if the individual is unwilling to help. This is, of course, not true. It is simply a reaction to extreme stress. Treatment is necessary for this, because the individual needs to work through his or her emotions of what happened.