This may be due to some ankle sprain..
Is the pain more towards the joint or towards the heel region.
Heel pain may be associated with local inflammation of soft tissue towards the base of heel, a condition called plantar fasciitis..
Next Steps
You can start with hot fomentation, apply crepe bandage for support, take analgesic with anti inflammatory medicine, apply analgesic ointment locally. Plan to get one X ray of Ankle joint if pain doesn't settle down..
Health Tips
Avoid walking and standing for long time.. Ankle stretching exercises can be done.. You may also use soft sole footwear for support..