I have had it going in one foot for about 1.5 years now. When it started I thought it was a a situation where I'd bruised something in there stepping on a sharp rock, but it would come and go and seemed to get worse when eating pretty unhealthy inflammatory stuff too often, like buckets of ice cream.
After some PT, taking diclofenac sodium for two different periods, getting an mri and xrays, the Dr says it's not arthritis and nothing is torn; it's just plantar fascitis, Achilles tendinitis, and peroneal tendinitis.
It's still going and I recently quit taking the diclofenac because I have to take other medications just don't like taking them. But it does work. It seems to feel better when minimizing inflammatory foods, getting plenty of sleep, and making sure to do some regular running to keep it loose. I typically run a lot but have dialed way back to tey to get it to heal. Discontinuing running completely seems to make it get worse.
Dr also had me try wearing some off the shelf orthotics ,but those really made my arch hurt because I'm used to minimal shoes with no support. I found some super thin insoles that have good cushion but no rigid support. The arch support is barely there but it is a lot more than you might find in a pair of Altra shoes. They've helped a little.
So the only advice I can give is try diclofenac sodium for a couple of months. It makes the pain go away completely for me but in my case it just comes back when I quit taking it. 75mg twice daily.
Keep it stretched and active but maybe dial back the workload a bit. Experiment with different insoles.
Minimize inflammatory foods and get plenty of sleep.
