A car crash can be a traumatic experience. After an accident, anxiety may be triggered by having to drive a car, riding as a passenger in the car, hearing loud noises that imitate the sound of a crash, or driving by the site of the accident. Anxiety can take many forms and have differing symptoms, such as difficulty sleeping, increased heart rate, rapid breathing, sweating, trembling, gastrointestinal problems, fatigue, intense feelings of worry or impending danger, and panic.