The last 2 days i've found i have quite a sore ankle but i have no idea what i may have done to it IYKWIM.
3 days ago i found a bruise on the inside of my ankle near the bone, showed DP i have yet another unexplained bruise but it hadn't hurt etc etc.
Wednesday night i went out with some lovely BB girls and as i was leaving i noticed my ankle was actually quite sore when i put pressure on it, but didn't think much of it at the time and though maybe i had just twisted it and not noticed.

Yesterday i woke thinking it was ok, walking seemed not too bad but as soon as i weight bared on it it killed, i kept it elevated last night in bed and it's still quite sore today, if i weight bare it hurts quite a bit, looks slightly swollen compared to the other ankle, no bruising outside of the one i found the other day but when i deliberately press my ankle down it 'feels' different (aside from the pain) to my other ankle.

Any ideas?

I haven't as far as i know twisted my ankle or slipped so i'm stumped.