Hi Life_Lamp,
I just wanted to give my experience but first, remember that we are all different and what may work for one may not for another. Functional medicine doctors are around for a reason -people must find benefit otherwise they wouldn't exist. I, however, have not had a great experience. Out of desperation, because my regular MDs didn't seem to be helping, I sought out functional medicine. I cringe when I think of how much money I spent. They ran a bunch of tests (all normal) and put me on a barrage of supplements saying that they would give me energy and help with my anxiety. Long sorry short, didn't work. I spent a lot of money and time for nothing. I'm not trying to be a downer at all, just wanted to share my experience. If I can save someone from losing a lot of money, I'm happy to do so!
I feel your frustration, you're not alone. Big hugs