Hurt the back of my ankle? Above heel, wondering what it could be?

i went to dancing for about 2hours. then jumped down a step and sort of landed on my toes, but it only hurt a little bit at the back of my ankle area. i just danced again, and it really hurts, to the point where i have to stop, doesn't hurt when walking though? Wondering what it is? I've had achilles problems before, but did not feel like this. ?