As you said you had an ankle sprain .. with swelling .. no pain at rest.. but you have stiffness.. have you visited a physiotherapist for the same ..
As we have modalities which will help you to reduce pain and also we will teach you exercises which will help reduce stiffness
For swelling.. you can apply crepe bandage and put your leg in elevation and do ankle movements..
Next Steps
Pls visit a physiotherapist on an urgent basis
Health Tips
You can hot pack or cold pack while travelling along with crepe bandage