You might be having a case of Plantar Fascitis, as evident by pain in the heels .You might continue one more course of physio and ultrasound
treatment.However, I would advise you to visit a doctor to rule out a stress fracture
In the meantime, give your heel some rest. Prolonged walking can cause and worsen plantar fasciitis
in individuals prone to plantar fasciitis. Apply ice packs on the heels intermittently. Have a pain relief medication like brufen after food. Wear appropriate, comfortable footwear. If overweight
, do try to lose weight.
Hope this helps.
Dr. Divya Kuttikrishnan