Athlete think w/sesamoiditis (clean xray 1 mo ago).pain getting much worse w/PT. Noticing ankle stiffness and top of foot discomfort. Stress fracture?

It's possible. Stress fractures in the midfoot are common after an injury to the toe region since patients compensate more during that recovery... which can weaken the midfoot bones. Definitely get checked out and an xray to confirm any fractures!