It's quite normal to feel sad, worried or anxious after a traumatic experience. But, if the feeling does not fade away with time, then it is an indication of a post traumatic stress disorder (PTSD). It is a mental illness that affects people who experience traumatic events. PSTD can severely affect a person's daily life and interfere with emotional functioning and management. But people can find healing and regain control of their lives with the help of an experienced & compassionate