Only changing your diet is NOT going to work.
I strongly suggest you find a doctor that knows what they are doing. The fact that they do not acknowledge saliva tests is a good sign that they are NOT going to be able to help you.
You need to take meds for adrenal support, but doing it on your own is not a good idea. You need to know WHY your adrenals are fatigued in order to get well.
Last night after talking to an expert I learned that hypothyroid is most often the cause of adrenal fatigue.
Therefore, find a skilled doctor who knows what they are doing.
The man who I feel is the best to help people is http://www.drlowe.com
He consults from a distance and I do not urge you to go it alone. Good luck.