I felt the same when I went to see, "Seven" many years ago when I dating my husband. He had to come to work with me where I worked alone and sleep on the floor.
My antidote for all the horrible "bad" movies that I have seen is to rewatch them when they come on television. I think it's like flooding--after I see them several times. It takes the horror out of them and they start to seem silly. I don't know if this will work for anyone else. I also have not learned to watch anything that I might have to use the antidote for, because my time is too valuable.
Good luck--remember it is just a movie which isn't real. Unfortunately they are designed to sicken and horrify us, so you are having a normal reaction to that phenomena. Your feelings are real, the movie is someone else's creation, maybe someone who is evil or sick or both. It's too bad that they couldn't use their creativity for beauty and love, but not everyone can.
Meta