Rig up a sling to immobilize your arm and shoulder. Put an ice pack on. Take some advil. Sit down and watch a movie. Sorry you're in pain. If you think it is broken, go to Walgreens, maybe, and get a brace. It will basically look like a figure 8 and will pull your shoulders back to keep your collar bone in place. There isn't much you can do for a broken collar bone.