Have u done some blood investigations like CBC, ESR, SERUM
URIC ACID AND SERUM VIT D. The most common causes of heel pain are increase in uric acid content in your body.
Next Steps
kindly get this investigations done and let me know through direct consultancy
Health Tips
start using silicone soles while walking will help u a lot. dip u heels in hot and cold water alternatly for 3 mins each