I had heel spurs decades ago which were painful and tender, worst in the mornings. It seemed like it would never go away, but I bought thick lambswool moccasins to pad the feet soles and stopped walking on hard surfaces. Eventually it went away. I don't know if thick cushioned soft soled shoes might help you too?

I do think our systemic PMR inflammation can drift into other parts of the body over time and cause seemingly unrelated problems. A few months ago while having my first PMR flare, the balls of my feet became very tender and painful when I walked which caused a limp. (Metatarsalgia or Morton's Neuroma, doctor will confirm at next appointment) My feet had been fine till then. I now wear only thick cushion-soled slides with arch support. They are the only thing that brings relief. Hopefully it will resolve over time.

I have a pair of each of these and switch from one to the other during the day. Archie's (AUD$60) are best for me. Oofos Ooahh (AUD$95) have a thicker curved sole which isn't so good for balance. Both of them mention Achilles tendonitis too.