I do 30 mins a day on the treadmill and find housework is a good one. Like Red Panda said it can keep you focused. But the best calming thing for me is a not-to-hot bath or shower, although a bath is better.

I'm still trying to figure all this out, but those things seem to help. What really bothers me too is not being able to focus on reading or a movie. I want to enjoy my Netflix but watch the movie for about 30 mins and then walk away. It sucks because I love movies. Maybe they're just sh-tty movies.