hello and welcome to hcm forum,
i am glad you wrote in, according to your query it seems that your body weight got completely over your ankle which sprained it.in such cases, we advise a complete rest for atleast 3 weeks, as the ligament gets teared and it takes 2-3 weeks to get repaired naturally.
is not at all associated with the ankle, until you injured your head also, i hope that did not happen.
i advise you to take some rest, avoid exercising for a week, if in case the pain does not go, then visit an orthopedics .
i wish you good health,