I too had/have pf, and here is what has worked wonders for me: Two years ago I went to an orthopaedic surgeon, who diagnosed pf and a heel spur. He put me in a boot that keeps the foot at a 90 degree angle. This position is best for healing pf. I kept the boot on almost 24 hours a day--I slept in it, and that really helped with the morning pain. (I always put a pillow case around the boot so I wouldn't get street germs in my sheets.) Doctor said to quit doing any impact cardio for 6 weeks, so I had to give up Cathe for a while. Even after the six weeks, I still slept in my boot for several months.
Also, I was fitted for custom orthotic inserts for my running shoes. Those were the best investment for curing my pf. I can't imagine exercising now without my inserts. I was determined to get rid of my pf, so I also did about
5 weeks of physical therapy. The therapist showed me some great stretches to do, and I still do them often.
After I quit wearing the boot, and I went back to exercising, I stayed away from impact cardio for a while. But now I'm doing Imax 2, Body Max 2, etc.., and I'm even able to jog/run with Cardio Coach. I still feel heel pain occasionally, but I immediately stretch my calf and foot. You can look online for some really good stretches for pf--they work great! Sorry to write so much, but I wanted to share what worked for me. Hope you have good luck curing your pf.
Valerie