Posted: 02/06/2014 at 12:58
Sounds like a problem I get now and then which I thought was achilles tendonitis or the start of it but the pain seemed to be more on the back of the heel rather than the actual achilles. I think it sounds like achilles bursitis... google that and have a read, see what you think.
Stretching my calves seems to have helped me a bit (both parts of the calf muscle).
*Please note that I have no medical qualifications, just years of struggling with various running injuries / niggles!