DHEA replacement in people with secondary adrenal insufficiency.

Hi everyone,
I am a 49 year old male.
Following a poisoning incident in 2011 I was diagnosed with secondary adrenal insufficiency.
My cortisol level was around 50 nmol at 8 am
I was put on hydrocortisone 20 mg daily, split into 3 doses.
Since then despite all my other hormone levels being normal and my cortisol now being back in check I have never felt right.
I suffer with very dry skin, dry brittle hair with excess shedding, fingernails with deep vertical lines, toe nails with deep horizontal lines, loss of libido, excess fat on trunk, poor muscle tone, sleep issues, lack of stamina, exteme fatigue, anxiety, depression and generally feeling lousy.
I have had just about everything else tested outside of endocrinology and all has come back normal.
I recently read an article about dhea being absent in patients with secondary adrenal insufficiency and wondered if this could be the cause?
I was very fit and mentally strong before this incident and have never got close to feeling like this again.
If anyone has any input on this, I would be very greatful to hear it.
Thanks.X.