Hi, I had problems with Plantar Fascitis a few years ago and it turned out to be a certain pair of shoes that I owned. However, a doctor I played golf with one day in Florida noticed my slight limp from the pain and told me that if every morning I would roll my foot on a tennis ball (to stretch tendon) for 5 minutes the pain would go away. It took about a week but I never had the problem again.
Hope that helps!
Rob