I suffered with it for a number of years and tried all sorts before I found anything that worked, ultrasound, steroid injections in heels, splints, anyway the one and only thing that worked was foot orthotics-(arch supports). Initially, I had bespoke rigid casts made (hugely expensive) but in more enlightened times I found a podiatrist (extra qualified version of chiropodist who understands biomechanics) who recommended some flexible comfortable orthotics which have a three-color different height of insert that you slot into a top piece like a supportive inner sole. Racking my name for the brand name but I have tried off the peg ones from boots etc but they were nowhere near as good these the podiatrist gave me at a worth every penny price of just £100.00.