In the wake of the tragedy at the Sandy Hook Elementary School in Newtown, Connecticut, the Centers for Disease Control and Prevention (CDC) would like to provide the following information to help cope with stress following a traumatic event.
Sometimes stress can be good. For instance, it can help you develop skills needed to manage potentially threatening situations in life. However, stress can be harmful when it is severe enough to make you feel overwhelmed and out of control. -->Strong emotions like fear, sadness, or other symptoms of depression are normal, as long as they are temporary and don’t interfere with daily activities. If these emotions last too long or cause other problems, it’s a different story
via cdc.gov