If you have been having more pain in the early morning hours and if it is at bottom of the heel and not at the back of heel ,most likely you are suffering from a condition known as plantar fascitis, which is not a worrisome condition. The soft tissue at the bottom of heel because of aging becomes inelastic and tight and cause pain ;more while walking. If the complaints are of short duration (less than six weeks) you will be benefitted with a short course of painkillers like diclofenac,physiotherapy including local ultrasonic rays and stretching exercises for the lower calf and plantar fascia . However you will need xrays and blood investigations like CBC,ESR, Blood Sugar, Sr.uric acid ,if you fail to get relieved after a week to ten days of the treatment.