Thanks for posting your query.
Your sprained ankle
needs the principle of RICE (rest, ice, compression and elevation ).
I suggest you to consult an orthopaedician nearby for a detailed clinical examination of ankle. You may get the X-ray of the area affected under his/her guidance to rule out any fracture
According to severity of sprain your doctor might immobilise your ankle by giving the cast. If it is grade 3 sprain , you might need surgical repair.
Wishing you good health.
Dr Saurabh Gupta.