I had this two years ago. My right food would buzz every three seconds. It was maddening. I was sitting or standing still, I could feel it. If I was walking or distracted, less so. Eventually it stopped altogether. I think it was due to nerve impingements, since I was also getting weird hand tingling too, although not like the rhythmic buzzing my foot had. I went through months of physical therapy to clear up the arm stuff, and am happy to report that it helped a lot.