ouch! my i'm having sympathy pains for you.
not sure what's wrong or what it could be. but one time i smacked my baby toe so hard against the tile i had many choice words and a big owie. it went away on its own after a while. lump and all, thankfully didn't lose the toenail either. hurt for a good long time.
was it hurting all the time before or just now that its hurting when your up and moving around on it? have you tried putting ice on it and taking ibprofin to help with the swelling?