Been dealing with PF for over 6 months now. The most recent bad flare-up actually halted me from running for over 2 weeks. What has worked for me thus far in getting back to running and at least keeping the PF at bay (I didn't say that there is not discomfort), but it hasn't stopped me in my tracks again.
-Deep, very deep tissue massage. Look into something like an NMT tool, basically anything that you can do to get in and run lots of lines in lots of directions along and into the heel, calcaneus, along the bottom and arch of the foot too. Kneel down and put as much of your wait on the foot being massaged and really get into the painful areas. Treat the whole foot still though. Treat the opposite foot too even though it is not affected. (I think the golf ball is useless and will not get into the fascia nearly as well).
-Long calf and soleus stretches. Up to 3 minutes each side, each position. Leverage yourself on a slant board, don't hang off of a step.
-Lots of deep massage in the calves and soleus as there may be trigger points that are part of the cause.
-Get a tennis ball into your glute medius/min/piriformis. See if you don't potentially have some issues in this area too.
http://charlieweingroff.com/pdf/TheTop10TriggerPoints.pdf
- Strassburg sock at night if you can use it and still get quality sleep
Try the massage work twice per day to start.
Also, look into some type of electro-stim machine like the old tens machines to use before running.
Its a good deal of extra work, but at least I am running again.