For your question how can I get a good diagnosis?
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In another discussion you started in the Chronic Pain group you mentioned that you have tried pain and treatment programs. Mayo Clinic has some information on Foot & Ankle Treatments including specialists who collaborate to provide you with the latest in advanced and innovative nonsurgical and surgical treatments - https://careinfo.mayoclinic.org/foot-and-ankle-mn.

Have you thought about seeking a second opinion or help from a teaching hospital or major health facility like Mayo Clinic?