I've been a long distance runner (30-45 miles/week) for quite some time, without any problems. Since Monday, I've had right heel pain that has been annoying and I haven't run in 3 days. I am not sure whether it is Plantars Fasciitis...since most heel pain seems to be PF, that would seem to be the likely cause. But I don't have some of the common symptoms - it doesn't hurt in the morning when I get out of bed, and the pain comes and goes throughout the day. Although it's pain, I'd describe it more as a "cramp" or a "knot" than as a muscle tear. It's also impossible for me to localize the pain as I can poke and prod my foot and not have any pain AT ALL. The only pain seems to be from walking on it or stretching it (by putting my toes on the floor and pushing off my toes, thus lifting my heel).
I'm not sure what to do about it, and to make matters worse, I had fully trained myself for a marathon that is 9 days from now. I ran 22 miles and didn't feel a single muscle ache, but then my right heel acted up. I'm totally bummed and looking for guidance on here.