How to deal with foot pain caused by flat foot that was high arch?

Orthotics : Or arch supports are very helpful or this condition known as a pronating foot.

Not good: The most common cause of a high arched foot becoming flat is rupture/tear of the posterior tibial tendon. See a podiatrist and get this checked out.

Have it evaluated: Have your feet evaluated by a professional and get the appropriate treatment. You may benefit with use of custom foot orthoces.