Your provider, including me, did formal education in a specific discipline. It could be medical school, nursing school, chiropractic college, naturopathic medicine, osteopathy, etc. What that provider learned in school was how to diagnose and treat conditions and manage symptoms. With every functional medicine practitioner I have met, there came a cross roads where managing symptoms and treating conditions wasn't producing health outcomes. So they went searching to better serve their patients.
Functional medicine isn't a specific discipline but more so, a health delivery system. Any health discipline can apply the principles of functional medicine to assess and treat based on systems and origins, opposed to symptoms and organs. The goal of functional medicine is ALWAYS to create health, not manage or treat disease. There's a vast difference in treating disease and creating health. If you're looking to be just a little more comfortable, functional medicine may not be for you. If you're looking to invest in your health, have a guide, and use those gains to better serve those around you, then functional medicine is what you've been searching for.