A little known treatment is to stretch the shin muscles. It turns out in many cases that it’s not caused by the calf muscle but rather the shin muscle being too tight and pulling on the calf muscle tendons across the heel.
A sports Medicine Doc for the Cincinnati Bengals turned me on to stretching the shin muscles and I was able to cure my plantar fasciitis in just a couple of weeks. No boot wearing at night or meds.
I just stretched the shin muscles every night and morning.