Having seen you dance on a number of occasions I feel qualified to
say that you do NOT dance on your heels - on the contrary...
However, what you describe sounds to me like mine auld enemy
<planar fascitiis> which our transatlantic cousins translate more
prosaically as <heel pain>. I know 'cos I went through hell and
chiropodists and God knows all what until I was desperate one day
and went surfing the web to find that <heel pain> gave me a
zillion references. The dignosis was unequivocal and the cure was
REST. Of course, I found out just as I had agreed to teach three
day schools and a weekend in the course of six weeks. I got
through them and took three months off dancing just walking
through classes and wearing outdoor shoes with insoles. I hated
it but it worked.
The web sites were pretty unanimous in describing the average
sufferer as middle-aged, overweight and into strenuous exercise.
Me to a <T> but hardly a good description of your own sylph-like
self. Could it be that the way, way high up on the toes has
finally caught up with you??