I'm excited to find out how your research ends.
Regarding the immune system.
For myself I can tell you two things
#1 My saliva that tested for cortisol also showed i had a very low immune system.
#2 Ive had problems with my endocrine system before. I had suffered 1.5 years with acute attacks of major major pain that had me floored. After seeing many doctors and emergency visits and being misdiagnosed they told me i had gall stones. So...i've had gall bladder removal.
Please keep us updated