It could possibly be Tarsal Tunnel Syndrome?

When entrapment compresses the nerve, it causes pain and a burning sensation, and tingling on the sole of the foot. This pain usually worsens as the day progresses and can usually be relieved by rest, elevation, or massage.
One of the most widely used treatment method for Tarsal Tunnel Syndrome is the use of an orthotic. An orthotic is a simple device that is inserted into the shoe. Orthotic devices such as HTP Heel Seats are able to relive pain, and facilitate the healing of Tarsal Tunnel Syndrome in a number of ways. First, the Heel Seats are able to add support to the foot, the heel, as well as the ankle in order to add structural reinforcement that the ankle needs.