I watched a horror movie ,so how can I stop thinking about it ?
Garbage in = garbage out! Find a peaceful image to focus on, and each time you recall a freighting scene, redirect your mind to something good.
Watch a comedy :)
I had the same problem.read a book,wash your face with cold water,think about something else,or sleep in your parents room.
I watched how they made all the special effects and stuff, it makes it seem a lot less real so it won't bother you as much.
watch license to wed or fun with dick and jane