Did you have thyroid testing?

Were you tested for Celiac/gluten intolerance?
Did you have antibiotics prior to this developing?
How long have you had this? Did it happen suddenly or slowly?

Were you tested for Charot Marie Tooth (hereditary nerve disorder)?

Do you have any symptoms in your hands? (hypothyroidism will affect the hands as well as the feet.)

The MRI may show something.

Do your feet get more numb with shoes on? Or do they bother you at night? Are they both affected about equally?

Have you had Xrays of the feet showing the sesamoid bones?

Do you participate in sports that could have damaged your feet? Track, running, Jumping, or ballet?

Sometimes you have to look a the little details to find an
answer that is elusive.