How long will it take to get better? I had explant 4.5 months ago.

I still have bruise-like pain, heaviness and itchiness in my left breast after explant over 4.5 months ago. There is no seroma, hematoma or fluid anymore, the other breast is completely healed and smaller. The lightning-like, shooting, stinging pains never went away, they seem to be getting worse. Also, that nipple does not contract like it used to. It is almost always flat and unresponsive to cold and touch. It is hypersensitive and hurts to touch or press. Anyone know why this is not healing?