Replying to What the hell is up with my leg?

okay this might seem like nothing, but it hurts like none other.

today in gym we were playing soccer, i meg (ball between legs) this kid and he sticks out his knee as i go around him. his knee hits me in the front of my hip (quad maybe?) and i seriously buckled right there. couldn't get up for about 5 minutes. i finally get up and sit down for gym. now i am at home, this happened at like 1 o'clock and i still can barely walk. didn't think charlie horses were that bad. there is no bruise or anything but it is seriously in pain just laying here with my leg straight. what is it?