Things that go POP in the night

My right foot, apparently. I was doing something yesterday, unloading the kitchen carts I think, and my foot made a rather funny pop. It was sore but walkable, until I went leaping offstage yelling "locusts!" Then my foot went "AAAAAAAAAAAAAAH!" About 2 this morning I woke up crying it hurt so bad, and after icing it all night it's very swollen. I have no clue what I did to it, but the last time I broke a small bone in my foot, it was rainbow colored by now. I have hopes its just a tendon thing. Doesn't make it hurt less that way, but at least I won't be confined to a walking cast for six weeks. It's going to make running around barefoot tonight and tomorrow a pain.