From what i can infer from the history is that you have inflammation going around the Achillis tendon at its attachment. Need to examine properly to be sure tho.
Next Steps
See a Sports Physiotherapist, if in Mumbai find Flex Physiotherapy Centre,Malabar Hill.
Health Tips
Do not stretch the calf, in acute stages that might make it worse. Apply Ice if the pain is too much. Releasing the Calf muscle manually will help.