Functional Medicine

I've been watching a 3-Day Virtual Class on thyroid, Diabetes, and using Functional Medicine. She is NOT saying to do what the doctor does not approve of. But, they do have labs and testing that go much deeper than what our Western Medical doctors can. Due to Big Pharma and the way our insurance is, doctors usually cannot go into as deep labs and testing as a functional medicine doctor can. I thought about taking a course on it. How does anyone feel about this? Have any of you dove into this realm of medicine, more in a natural way than just prescriptions? I realize that MANY have popped out of the woodwork. Facebook is covered with them. What is your opinion about taking the course and getting certified? I thought it was less expensive for me to learn this. Then I could help myself, as well as other,s as far as diet, supplements, getting cortisol and stress under control, and so forth.