Functional medicine doctor recommendations? ME/CFS+Long Covid recommendations?

Hey GR! I love my PCP, but we are coming to the end of what she feels she can do for me, recently arriving at an ME/CFS + Long Covid diagnosis. She recommended looking into functional medicine. My concern is the field of functional medicine seems hard to sort out the legitimate from the woo-woo. I am curious if anyone out here has strong recommendations for functional medicine doctors, and/or anyone else also dealing with ME/CFS + Long Covid has found any other treatments or practitioners in this area to be particularly beneficial to them. Thank you so much!