Possible causes of the symptoms that may need to be considered include fractures, ligament/ tendon injuries, infections, inflammations like fasciitis etc, spur formation,
heel fat pad syndrome, arch issues etc. It is advised to consult an orthopedician for an accurate diagnosis and appropriate management. Meanwhile it is advised to rest the foot and avoid weight bearing. You could also use some OTC NSAIDS for pain relief.
Hope this helps.
Take care!