1. Not all "podiatrists" are MDs. Make sure any foot specialist you see graduated from a legitimate medical school with an
MD. Then look at their additional qualifications for their specialty. Your problems may or may not involve plantar fasciitis, but regardless make sure you're seeing a well qualified
MD foot specialist.
2. When I had my bout with plantar fasciitis in my latter 50s (20 years ago), my GP said I had bone spurs and recommended surgery. I then saw an excellent
MD foot specialist who chuckled and said ' at your age most people have bone spurs and they seldom cause problems".
3. Our feet are designed such that when we walk we're supposed to land on the back part of our heel. As we age we tend to walk more flat footed so our feet land forward of where they are designed to. Unfortunately that is right where the plantar fascia (the band of tissue that connects our heel to the front of our foot) attaches to our heel bone. Walking flat footed causes inflammation of that tissue . . . called plantar fasciitis.
On my doctor's instruction, I started doing two simple stretches a couple of times each day as well as making a conscious to raise the front of each foot with each step when walking. I also used inexpensive OTC heel pads in my shoes.
As others have said, it took a while (six to eight months) to completely resolve but the problem hasn't reoccurred.
I know first hand how frustrating it can be when you can't get a clear, consistent diagnosis from doctors.
Good luck.