Physical movement always helped me. Cleaning, dusting, straightening, going for a walk.
At home, I would watch an old movie...not the news. When my mind is racing, the news is the worst thing. Craft shows on TV worked very well. It was amusing, and my mind could start working on some craft project I might like to do!
Call a friend, but don't go on and on about the obsession, ask your friend all about what is going on in his or her world--and really listen.