Hello there...., looks like you have developed plantar fascitis....There are also other causes which can also cause heel pain.... Which includes bursitis, stress fractures, Achilles tendonosis, peripheral neuropathy etc...., As stress fracture is most common in this age group it has to be ruled out.... this type of fracture is caused by repetitive stress, commonly caused by strenuous exercise, sports or heavy manual work.... Mri and other imaging studies will rule out the causes....Kindly consult orthopedician for further evaluation....