I think people think AF is a theory until they witness it firsthand. It is very real. Cortisol is the most important hormone your body makes. Without it, you die.
Does sudden stress cause you to shake, weaken and make you want to throw up? Does your heart race for no reason in the evenings? These are some signs of real adrenal fatigue.
Get a 4x saliva test and see what your free cortisol levels are.