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where do they come from and how do they get in your brain if its not a memory then my own sick evil twisted corpse brain is making them and makes me picture decapitating it

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Sometimes it's just visual images for a feeling . . . anger, frustration, fear, etc. Sometimes they are memories (either real events you've experienced or something you've read, watched on TV/news/movies, or a story you've heard).

Have you tried art therapy? Maybe do some art representing the images, then hide or destroy the art to "get rid of" the image from your mind?