Hi, I am looking into the adrenal issue too and found that licorice can help with cortisol production. I had the worst flu weeks ago and don't seem to have recovered yet.

"Licorice extract not only boost cortisol bioactivity, but the herb also boost the effects of mineralocorticoids by inhibiting two key enzymes in the break down of aldosterone, the principal sodium retaining hormone (abstract). Both the cortisol and aldosterone effects of licorice are very valuable to those with chronic fatigue syndrome and/or adrenal insufficiency."

The above is taken from this very interesting site about licorice:
http://www.jacemedical.com/store/licorice1.html

M.A.