Hello @leighton68, Welcome to Connect. Another member @marielynn, started another discussion and mentioned she was thinking about going to a Integrative & Functional medicine doctor and was wondering if anyone has done this and if it helped. You might want to scan through the member comments.
-- Prednisone for over a year along with Kevzara for last 5 months: https://connect.mayoclinic.org/discussion/prednisone-for-over-a-year-along-with-kevzara-for-last-5-months/

I'm not sure there is one root cause of PMR but it's definitely good to learn as much as you can about treatments that can help you manage the condition. Here's some information I think @dadcue may have shared in other discussions and may have some additional thoughts or suggestions on seeking a functional medicine doctor.
-- Understanding PMR - https://www.pmrandil6.com/.

How long have you been diagnosed with PMR?