Is the pain on 1 or both feet? you could try putting a wedge under the inside of the heal and add a little more padding under the arch this should put your foot in a better position and distribute you weight more on the heal and arch and less on the ball. I'd see the doctor but also try to find a professional boot fitter it will be worth it.
It's on both. The stores that I purchased the boots from all had professional boot-fitters.