Sharp pain in arch of right foot, cycling every few seconds apart. it calms down and then starts again. When it started this pm, I elevated the foot, used my tens unit with a cold pack for about an hour. The pain went away, and I was able to walk with only minor discomfort. About four hours later it started up again, and I am back to the same treatment. The pain is sort of on the side of my arch. I am 73 years old and am very active in addition to supervised workout 3-4 days a week.