Hello madam,   Your complaints point towards 2 diagnoses, one being plantar fasciitis other being retro calcaneal bursitis. Both are initially managed conservatively with medication and physiotherapy. Would be best to consult an orthopaedic surgeon ASAP.

It might be a case of plantar fascitis or heel spur. First of all get an xray done to get the exact diagnosis but till then you can have some foot stretching exercises and avoid walking bare foot. Wear some soft cushioned shoes or slippers which ever you prefer whenever you walk. Ice massage will help to get instant relief.