Sorry, I am out of it, you did not post the cortisol tests with ranges. If you have low cortisol then the doctor needs to run a stim test.
Then it sounds like you have Hashimoto's. Are you being treated for your thyroid? Your adrenal tests looked normal. Unless you have abnormal sodium and potassium, then I would think (as a layman) that the issue is not adrenal... But they thyroid one can make you feel like crud all by itself!
I did acth, aldosterone, potassium and sodium. Also antibodies for hashimoto which are high.
I am not a doctor. We're all the cortisol tests 8am? Any serum or just saliva? I would get other testing to support it like antibodies, sodium, potassium and more ACTH. Last a stim test. Then based on those results the doctor can determine if you need replacements.
Sadly fatigue can be so many things!