The causes of pain in the feet range from bone spurs to bartonella. Try this site to see if you can home in closer on it:
You haven't been specific of cause. Enter heel and you may get 1 or 2 heel spurs or bone spurs. Check also bursitis as you can have a bursa under heel. Try acute pain. 2 will come up under that search. I did an overnight sweep with central med frequency for 8:45 and helped immensely. High frequency hurt, for me any way.
Plantar fasiciitis comes to mind:
For more details, please check: