OK, based on your responses and your complaint, my assessment is that you have something called plantar fasciitis.
Plantar fasciitis is essentially heal pain, which many times is caused by calcification of the bone on your foot. When pressure is put on that area of the heel where the bone has been built up with deposits of calcium, pain will result. You can read more about it here:
You have some options as far as treatment, but I would start by seeing a podiatrist.
Since the pain is getting worse I would suggest that you call for an appointment as soon as possible.
Another option that you have is acupuncture in which I typically help people to get rid of 100% of their heel pain in 2 to 3 treatments. Usually by the end of the first treatment, people usually experience a minimum of 50% pain relief!
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P.S. Best of luck, if you'd like to try acupuncture you can find a local practitioner by going to www/AcuFinder.com