Alas! Not all health professionals are created equally! I'd ask in a health food store what name the people there hear repeatedly as being effective in cases like yours. I received great physical rehabilitation in a hospital's physical therapy department and fantastic care from a really great chiropractor for other issues, that resulted in losing the knee pain. I've been reading that fasciitis can be helped by a strap kind of gizmo that points your toes upward, elongating the tissues (or whatever) in the ankle-heel area, but I know of no one who's tried the device. I, too had spent over $300 apiece on orthotics, which, for me (at least, this particular pair) were worthless. When I feel a knee twinge, I start hitting the leg and knee exercises again, on both legs, not just the tender one, to maintain better balance of the two sides of my body. I also FINALLY noticed that the way I was entering and exiting the car was causing part of my back and knee problems. Healing seemed to go much faster after changing that simple little maneuvering.
Due to very low Vit D, I took high Vit D daily, plus minerals, with emphasis on magnesium, multi-vitamins, and other supplements. The books I've read about Vitamin D insufficiency fairly well outlined a lot of problems I'd contended with for decades. I'm convinced that my knee pain was related to my spine, and exacerbated by the way I walked, as a result of the back issues (which I stupidly thought had "gone away").
I have read that many people who have heel pain are also hypothyroid, which is true for me, also. You know how you flip your hand around at the wrist really fast after burning or hurting your hand or fingers? Mimic the same general action at the ankle several times a day, each time doing it until your foot "feels alive," for want of a better explanation of the sensation that follows such shaking. Since extensive and frequent wrist-shaking let me avoid carpal tunnel surgery on my wrists, I tried it on my feet, and, teamed with the nutrients and chiropractic adjustments, my heel pain, which had nagged for over three years, finally went away. Hope some of these suggestions might help you. Hot Epsom salts soaks and massage gave temporary relief. Try Googling, too; can't hurt! Good luck!