I'd never heard of it until I myself started to suffer with heel pain and then it seems everyone around me had had it at one point or another. Seems to hit people who are into middle age and/or could stand to lose a few pounds - although one of my work colleagues is fairly fit and in his early 30's!
I went to see my GP about it and he wasn't much help - lose weight, gave me some specific calf stretching exercises, told me to take ibuprofen and come back if i was 'desperate' for a coritsone shot.
My internet research told me that, even with a number of interventions, this could hang around for up to a year and eventually seems to clear itself. I did calf stretches on a regular basis, gave up on taking anything for the pain, tried several different kinds of shoes (but not heel inserts) and - the thing that gave me the most relief? A frozen water bottle. Three times a day for 15 minutes, I rolled it back and forth under my foot - usually when sitting.
Not only does it help with inflammation, it encourages you to do a natural stretch of the muscle that is tightening and causing the problem in the first place. I did this for months, and eventually, after nearly a year, my heel felt completely better.
Now my DH is starting to suffer with this, but he also intends to see his GP to make sure there aren't heel spurs or something else going on...