It All Began With A Dull Pain In My Right

It all began with a dull pain in my right heal at the beginning of the summer. I got a job where I stand a lot and my heal began to hurt more. I thought it was my worn out shoes so I got some new ones that fit good with an insole. I have bad feet to begin with. As the summers progressed it's gotten a lot worse and even more painful like a sharp stabbing sensation. It goes away with rest but as soon as I walk again, it starts to hurt. I didn't do anything traumatic to it. I want this to be healed. There is also little inflammation. What could this be