Urgent! I hurt my foot BAD. Hospital?

Okay so way earlier today around 3-4pm I slid down the stairs in my house and my foot fell under my bottom and I SLAMMED all my body weight onto my foot. It didn't really hurt at all, I actually laughed because my best friend watched me fall. Just about an hour or two ago though my I was laying in bed doing homework for about and hour and half and I tried to get up to get some water and my foot just started THROBBING with pain. It is a very sharp and swollen feeling pain and I can't move my toes, my foot, or my leg without it hurting. It even hurts now and I'm not even moving it! I called in my mom and she looked at it and told me to put it up (she's really delirious tired though and didn't pay much attention). I want to know if you think I should go to the hospital tonight or just wait it out until morning. I mean I can't move unless I hop on one foot and EVEN then it hurts bad still /: What do I do? What do you think happened?