What Causes Tightness And Pain In Heel Despite Having Normal X-ray?

I have been having pain in front of my heel on outside of the foot for a few weeks and it is getting worse. Had an X ray at rural clinic and doc says no stress fracture, probably inflamed joint. I can feel the skin tightening and internal movement inside my foot when I walk on my toes, as if my cuboid is dropping down with each step? I have almost no pain if I walk on my toes or the very rear part of the heel of my foot, but walking normally causes severe pain. Using my hand to manipulate that area hurts a little but does not reproduce the same level of pain as normal walking. I don t have any bruising. What s going on?