There's one thing that has helped me calm over the years when my mind races. It comes from a series of books I was reading years ago that I combined into a template that I can quickly copy and use. It's a hybrid from a few things I was reading and trying to deal with at the time. I find that this and taking walks while listening to calming music (M83) will help calm my mind from anxiously racing and sets me on a better thought process. I save these as journals in a text editor but you could do it on paper and recycle it after. 

The point is to do it free from distraction. It's was helpful for me to set a timer, so I had to do this for say 15-minutes, no phone, or otherwise. Start small, start with 5-minutes and work your way up. If you don't feel better, you can get your money back 😉.

With repetition, it genuinely makes me more gracious and mindful of the good in the world, not just the anxious things.