The heels of both feet throb for days at a time. i have mild neuropathy in rht ft, but throbbing pain is in both feet. had mri, xray and is good. what?

Since you already: Know that you have a neuropathy, presumably you saw a doctor already and some kind of workup for the cause of the neuropathy was done (i.e. Check for diabetes). Neuropathy itself can cause the pains you have. A specialist in physical medicine and rehabilitation or neurology can do other tests like emg/nerve conduction studies to look for other causes like a tarsal tunnel syndrome.

Abnormal nerve: Neuropathy is a condition resulting from abnormal nerve function. Neuropathy can be due to certain vitamin deficiencies, nerve damage due to trauma, alcohol consumption, radiation, side effects of certain medications, or due to certain medical conditions such as diabetes. Treatment varies depending on the cause of the problem. Have it evaluated and appropriately treated.