I am wondering if you have found any relief. I won't go into detail but the brain fog and memory loss is the same and I did the saliva testing as well as blood testing for cortisol which is low in the AM, very low, but not low enough to be clinically diagnosed with Adrenal Fatigue or Failure. I too have had EVERY test possible as mine started with Chronic Fatique Syndrome 6 years ago. The fatigue has passed but the low cortisol symptoms are still very strong and disabling. Morning work is very difficult. 5pm-11pm is my best time to work and be able to concentrate. Anything in the morning triggers an all over negative stress response which messes me up completely. I used to be so bad that I would "crash" about once a week and it would take 2-5 days to recover each time. I learned what I can't do in the mornings to avoid these crashes.