I had the end of three toes amputated several years ago. Now I am having a throbbing pain in that foot. What causes it and how can I get it to stop. I am 66 years old my health has dropped 3 inches since i broke my T12 vertebrae 10 years ago.. my weight is currently around 225 lbs. I have had lot of prednisone for severe asthma.thus my immune system has vanished .I've had one heart attack caused by blocked arteries,and in the left foot I have had surgery for Charco and mersa in the left foot as well another type of infection that has just cleared up.