Maybe try meditation? This just sounds like obsessive thought. You'd want to stop thinking. Generally, it doesn't do much good to suppress thought, kind of harmful. You kind of want to let it settle like sand in a glass of water. If you try to push it down with a spoon, it'll just whip around and keep floating around. If you can just sit still with your mind without whipping around a no-thought spoon, maybe it will all settle to the bottom and you can just take some breaks from thinking.

Perhaps give this a try: https://wakingup.com/

I'd say, "just stop thinking", but thinking about it or framing it like that never really works for anyone.