It’s normal for employees to experience flashbacks, hypervigilance, sleep loss and feelings of sadness or low mood after an event. If these symptoms continue to persist or get worse, an individual could be developing post-traumatic stress disorder (PTSD). The symptoms of which include extreme physical reactions. Such as nausea, sweating or pounding heart, nightmares, extreme anxiety, invasive memories and intense feelings of distress. These can make the individual feel like the trauma is still happening. Severely impacting on them.