Old thread, but worth a comment. Don't stretch, esp eccentrics. That will further inflame it. Don't waste time strengthening intrinsics. Don't go to PT; that, too, is inflaming. Cross training is inflaming. Shut it down for a bit, self-massage it, and return to running slowly, slowly. Roll with ice after each run. Consider some over the counter insoles. No rehab, no stretching, no Theraband, no self-treatment YouTubing. Rest it, then use it, then ice it. You will get through it. Oh, also don't get it injected unless you make your living running. Injury is usually a message about overuse. I personally like 4mm drop and I don't benefit from the conventional wisdom that PF requires a lifted heel. It can benefit from arch support. Most soft-tissue injuries heal in their own sweet time. And I personally don't realize the benefits of rest until I start back, which may have to do with blood flow and scar tissue.