Why Is My Brain Torturing Me?

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From a teen in the U.S.: It feels like my brain is torturing me. I feel like I’m tied to a chair and my brain is forcing me to look at vivid, disturbing and extreme thoughts that I don’t want to see/do and I’m afraid will happen. It can be very crippling sometimes. I want to know what this is. I know I should see a therapist or something, but I just wanted someone else’s opinion.