I find your picture in your profile very interesting. If you have hypertension, which I have, you cannot ingest more salt as it will increase your blood pressure. The problem with salt water flush is that if you have enough sodium chloride in your body then you will not absorb the salt from the salt water flush. But in people with hypertension who are trying to control it, have a lack of sodium and when they drink the salt water they will absorb part of it causing an increase in blood pressure and a lack of flushing effect.
I have tried in the past to do a salt water flush and the only way it worked was to repeat it every day for several days but then my blood pressure skyrocketed. So I would not recommend it for people with hypertension.
Having adrenal fatigue with hypertension is very unusual. Are you sure you have adrenal fatigue?
You could try taking 7Keto supplement to alleviate the fatigue symptom. It is not a cure and should not affect your hypertension.