Freshly received AF diagnosis – what to do?

I have basically just been diagnosed with adrenal fatigue. My doctor moved his office to a new medical environment right after this and I could never really ask the most important question: what do I do with this diagnosis?
My cortisol is very low, what more is there to say?
I've looked at the 2002 book by Dr. Wilson and would like to pose the question if there is a more precise and modern way to tackle this awful problem (even if his book doesn't seem outdated), still with the basic question: What should I do? What first !?

Any help is much appreciated

-sanshiro