I cured my pf by wearing two pairs of thick socks. Really - it worked great. Don't know if it might help you, but previously I could hardly walk, and by wearing the thick socks it went away.

I no longer have the pf, but I am also no longer running. I got mine originally from playing a lot of badminton, which, when played on an inside court, puts a lot of pressure on your feet and ankles as you change direction very quickly, as good badminton is a vey fast game.