I also have OCD in the form of obsessive thoughts and had a very similar experience. Brain just computes extremely random, irrelevant scenarios throughout the d

I also have OCD in the form of obsessive thoughts and had a very similar experience. Brain just computes extremely random, irrelevant scenarios throughout the day putting tons of serious effort, and it's impossible to stop. Thanks to CBT I learned how to deal with them, and for the most part it doesn't affect my life anymore, which is nice.