I'm a 67 year old flat footed male whose ankles are slightly pronated bilaterally. I have a lot of trouble walking without chronic pain. Last Sat. I developed a cramp in the arch f my R foot that took days to work itself out. I began using a strong toothed vibrator on my feet, and placing it on the balls of each foot produces weird nervous sensations of pulsing and electric-like prickling. The areas are insensitive to manual pressure. Why does this happen?