@sammy An alternative to a tennis ball to roll under the painful area is a small orange juice bottle filled with water and then frozen.
As a PF sufferer on several occasions you have my sympathies. Been out of serious running action for almost a year now with the latest bout. Lots of vitamin I, lots of stretching, failed physio, a steroid injection, more stretching and rolling with tennis ball and ice bottle, gel heel inserts and it’s still giving me grief. Custom orthotics are on order, but he didn’t spend long looking at my feet etc which is a bit of a concern.