Retrocalcaneal Bursitis in racing flats---help!

Just to verify - you had never run in those shoes at all before the race?

And, have you been doing many/any workouts at 10k speed or faster prior to this 10k race?

I currently am struggling with the same thing, which started 4-1/2 weeks ago after a couple of days of training on the roads in my racing flats followed by an XC race on a hard-packed fire road in my spikes. I try to ice the area after runs, and the best thing that I have found for keeping me running is Dr. Scholl's gel heel cups in my most cushioned trainers. Sometimes the pain goes away as I warm up, and sometimes it doesn't. When it doesn't warm up, I just try to walk briskly for the same length of time I planned to run. It is improving, but very slowly, although I have done 2 5k XC races since it started, which does bother it more for a day or two. I figure it will take at least another month to substantially clear up.

This is a potentially VERY serious injury. My immediate recommendation to is to buy new shoes AT LEAST 1 1/2 sizes larger, to keep the heel from impinging (notice spelling of "heel").

i did one track workout in the racing flats prior to the race at 10k race pace...heel felt a little sore afterwards but not enough to consider not racing in the shoes