There can be multiple causes of such pain and some time we can not find any sure diagnosis. So i can understand your frustration. Fromm clinical experience i believe that some foot are not in normal shape, there bone alignment is slightly abnormal not so much that we can not pick it up on MRI
.I would advice you to show it to a foot specialist and change his footwear. Also steroid
shot can be tried. According to that we can plan further management. I do not think TB and rheumatology as MRI is normal.