Hi Silvia_ng,
How are you feeling today? Hope you are not that stressed today. I encountered a similar situation when I was very young. I couldn't sleep for awhile and the image of the scene was hovering in my mind for a long time too, even now I still remember bits of the scene .
It would be good if you could share this emotion with someone to lessen your stress. Hope you will be much better next week. Do remember this takes time...