Its plantarfascitis which occurs due to inflammation in the cushion like structure present in the heel. Consult a physiotherapist.
Next Steps
Go to a physiotherapist.. Ultrasonic therapy +wax therapy +some stretching exercises +mobilization exercises for plantar fascia will be helpful for sure.
Health Tips
At home.. Rest +hot water fomentation +pain killer gel +no long sitting +no leg hanging +no cold exposure +no hard footwears +no long walk/standing +use heel cushions.