File and forget is incredibly effective when you have ADHD. There are just too many things that are "interesting" that you'll never have time to do anything about.
Just write it down (or an equivalent) so your brain can stop worrying about it. You'll find in a few weeks time the things that didn't actually matter are gone.
When I was having anxiety problems it was also an extremely effective way of getting out of the circular thinking loop. Write down all your worries on a new tab in Notepad++. All the worries stopped circulating. When I might occasionally look at that tab in a month or two's time. usually I didn't even care about any of those things anymore. Even though they'd all been thought obsessing distractions a couple of months earlier.
And lists, lists, lists. I'm at my most happiest when every day I create a short-ish to-do list for work and a list for home and throw it away at the start of the next day. I try and keep it below 7-8 things, in reality I often get 3-5 done. I fall out of the habit fairly frequently, and that's often when I start feeling overwhelmed.
Plus exercise, exercise, exercise. If I haven't exercised for more than about 5 days, I start becoming a right asshole who gets anxious about the most ridiculous things.