The pain exists only when flexing my foot toward my shins; this occurs in thoses instances when I'm in a seated position with my legs straight out in front of me and I'm leaning foward to stretch my hamstrings. This is the position where I first noticed the problem. I have also been noticing the same sensation when I bend forward to reach for something on the floor.
The pain is at the bottom of my heal and not the back of my heel, if that helps.
I've never experienced this before and I'm a regular exerciser.