What does it mean to dream about having a dream that you are in a car accident and die then you wake up and you have stitches and then wake up to find out it was all a dream?

This sort of dream-within-a-dream is an effort of your own subconscious mind to tell you to "wake up" and to face your real situation as it is. The point of the dream is that you think terrible things are happening to you that are not nearly as bad as you think. Your own mind is urging you to stop exaggerating your problems and to recognize how well you are doing.