what did i do to my wrist?!

on tuesday walking inside from gym, i tripped walking over a snow bank and fell and landed on my left hand flexed back like it would be if you were doing a push up and then thursday, in gym again, playing kick ball, i was was at third base and some body ran past me and pushed my same hand back but farther when it was already sore, now (saturday) it's very sore if i move it, it's very swollen, and my thumb is a little sore if i move it too, but not that much. i know it's not broken cause i can move it, but do you think its like sprained or just like sore because it was over-extended....thank you in advance!