Suggest Treatment For Severe Heel Pain

I am having a terrible pain in my left heel whenever I rest and get up. When I rest (sit or sleep), my heel doesnt hurt, but once I get up from my chair or bed, I am not able to walk normally for at least 5 mins. I limp on my left leg because of the severe pain on my left heel. The pain, in a scale of 1 to 10, is 9. What am I suffering from? I am 28 years old this year and I am 1.91m tall and 110kg.