Hi...for what its worth I had a severe bout of PF for about 6 months, I tried everything, custom orthotics, stretching exercises etc. Someone suggested Birkenstocks so while in the mall one day in agony I bought a pair. I wore them everyday from the time I got up til I went to bed. After three months I had no more pain and have not had a problem again (5 years ago). You have my sympathy its a horrible pain, I hope you find relief fast!