Only heel pain?

I've been suffering from plantar fasciitis for a couple of years now. I had a cortisone shot two weeks ago. My arch feels great now. But my heel seems to hurt a lot! And it's been over a couple of weeks so I know it isn't the steroid flare (which was pretty bad when I had it). I only suffer pain in the heel now. What should I do? It's not going away. I'm 17 and it's very depressing having this injury which I lost two years of high school athletics over.