Re: Insomnia and thirst, going mad :(
Well, if it's subclinical enough (that is, a non-Addisons dysfunction), you won't be on the radar - that is, you're on your own.
Maybe you could see Dr. Peatfield in the UK (he does outreach days), who specialises in adrenal/thyroid problems, if you're after something conclusive.
The adrenal stress index (saliva x 4) test is a good start to see what your cortisol/DHEA is throughout the day.
Personally, I've contacted a practitioner in Scotland to begin with ARL's protocols, mainly because I suspect copper poisoning to be the final straw in bringing me to the later stages of AF.
Dr. Peatfield was mentioned on here before by homesickalien and it seems he's fairly well-respected.
Have you seen Dr. Rind's adrenal/thyroid symptom matrix? Google it...