Also when you are standing keep changing the position, lift your
foot off the
ground for sometime and let your
foot bear the body weight alternatively. If possible keep a small stool nearby on which you can rest your foot from time to time.
Plantar fasciitis, arthritis of small joints, diabetic neuropathy, hypothyroidism, high blood pressure, over weight, deep vein thrombosis, wrong foot wear, gout, etc are a few causes of sore feet with heel pain. A high ESR by itself is not diagnostic.