One thing that helps me in general, is to just walk and/or exercise. I try to do different exercises, a few push-ups etc, but often I just walk for an hour/half an hour, in the hallway, I try to either just focus on counting my steps, or I focus on something positive, like a nice moment in my life, and I noticed it helps with the thoughts, at least for a while, and sometimes there is even good ideas that cross my mind while I walk, like a solution for something, even weird stuff, like something I haven't been able to remember in years, and suddenly it pops in my mind. And its good for your health at the same time.
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That's the way things come clear. All of a sudden. And then you realize how obvious they've been all along. ~Madeleine L'Engle