i'm playing a basketball pick up game - 2 on 2 earlier this afternoon. i started off fine and there was a little pushing going on for rebounds, normal play. i get a rebound and my left ankles rolls to under me - so the outside of my left foot is on the edge of the floor with my body on top of it and i fall down. i know i did something to it, but i continued to play after limping it off. was able to run a little bit and i was playing well enough to still score more points than the other team.
well, about 5 minutes later after coming off a screen and trying to roll to the left, i plant my right foot to make a sharp left, my left foot hits the ground and rolls hard just like the first time, but much worse.
something happened, something pulled or stretched that shouldn't have.
i didn't ice it - i know, i know i should have

and i'm just trying to walk it off, but i know tomorrow its gonna be swollen.
just looking for any advice on what i should do and for future reference some ankle exercises to help prevent my ankle rolling.
i have no history of ankle problem - last time i had a injured ankle was from a slide tackle back in junior year of high school, 6 years ago...