What kind of foot pain do I have?

Yesterday, during my football game, I fell and two people landed on my leg, one of which landed on my foot. I didn't really notice the way my foot moved but all i know is that my foot was crushed by a big lineman. It started to hurt and I told my coach I had to come out but it was an intense game and he told me to finish the game so we can win. It didn't hurt me too much then but later on at night, when i took of my shoe, it hurt really badly. Now it hurts along the bottom of my left foot. I noticed that when i bend my big toe inwards, the bottom of my foot hurts. The only way I can really walk is by keeping my foot flat, so there's clearly something about pushing off of my toes. My foot doesn't hurt when not in use. I've never had any problems in my left foot. Does anyone know what this could be, like a sprain, strain, avulsion? If so, please tell me and please suggest what I can do to help my foot?