I'm battling it now for 5 months and only a little intermitten relief: at its whim. Doctor also prescribed stretching and exercises, meds for inflamation. He said that biking wasn't going to aggrivate it any more than walking-we all have to walk. But, he said for me to take out the running from my schedule; it would prolong the recovery period. But, he also said that if I wanted immediate relief, with the possibility of it never reoccruing, to get a cordisone shot directly in the arch. I opted for the exercises; but if it doesn't work, I will get the shot. Good luck!
Urbanmonk