I'm really sorry to hear that-- it's a very disappointing loss. If they are really broken, even if not completely through, I think you there's nothing you can do but finish snapping them off. If the roots were well established, they will likely send up a new shoot, but of course then you will have a little baby tomato plant instead of a nice big one. If it's just a little bit broken, you could try leaving it to see if it can heal.
I've been letting folks at this forum do the experimenting for me, to see if I want to try the topsy-turvy method. So far, reading all the different results, I'm not really persuaded. I think this would not have happened to a properly staked/caged tomato in the ground. Last year my caged tomatoes went through hurricane Ike. The winds were so strong the tomato cages bent at ground level, but nothing happened to my plants.