wellcome to Health care majic.
your complaints are suggestive of an ankle sprain
You can follow PRICE protocol
to get relief. P- Protection- by proper positioning in neutral position, R-Rest-avoid prolonged weight bearing positions like standing, stairclimbing, running etc, I- Ice- ice cube massage/ cryo pack at least 3-4 times daily for about 2 days + Vapo coolent spray every 2-3 hourly, C-Compression- crape bandage/ ankle cap, E-Elevation- keep your foot above the height of heart with pillow support.
This protocol you have to follow for 2-3 days. If you have some NSAID
(non steroidal anti inflammatory drugs) you would get amazing results.
Application of Kinesiology tape by a cerified Sports Physiotherapist will reduce your pain immediately
Wish your pain comes down soon