My brother was in a bad car accident in which the car flipped three times, over a guard rail and into a ditch. The car came to a stop on its roof in what is usually the shallow part of the lake.
He walked away relatively unscathed with only a broken nose and a cut on his head. That night I stayed with my sibling while he slept. I stayed awake until he fell asleep and woke up to check on him through out the night.
I know he would do the same for me, so I think family is the best way to get through car accident stress.