Agree with Quicks101. Don't let that happen. I have a horse diagnosed with heel pain by three different good equine vets over the course of time I have owned him. Stretched tendons, ligaments in the heel.I would also ask the vet to explain what heel pain your horse has, because each case may be a bit unique as to the exact condition.
In my case each time I let this reoccur it became weaker. Get a good shoer(I have been fortunate to have some great shoers), try to keep the degree of their foot the same(once you establish what is most comfortable for them) and stick to it. Do not allow too tight of a shoe and be sure there is support all the time around the heel. This horse has been this way the whole time I have owned him, which is now 14 years. Unfortunately it took me a few years to figure it out. Probably if I would of clued in earlier, he would of never hurt it again after the first time. Just didn't know and didn't listen. The horse always tells me when things aren't balanced. Still happily running barrels though!