I totally agree with squad and ratter here, I cannot see that one of these would help. I had a friend once who used to complain that the soles of her feet used to hurt when she walked. She was soon after diagnosed with diabetes, put on low doses of insulin, which seemed to help. I don't know if this is a typical symptom, but it might be worth checking out, just in case.
Squad, do you think this could be a possibility?
kloofnek, I hope you can find a solution soon. Best wishes.