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As an autistic, my brain makes connections and patterns constantly and has thoughts flying through it all of the time. It doesn't seem to slow at any point and it can be exhausting at times. I expect this is even more severe in the ADHD brain.
If a drug existed that could turn off these thoughts, would you take it?
The reason I ask is because I went through a stage of trying meditation and it never seemed to do anything but one time it felt like my thoughts had totally stopped, my mind went blank. It didn't feel calming though, I actually freaked out and have never done it since!
I'm not sure I'd want my thoughts to stop or to be like those people who have no internal dialogue.