Right, you've described my current plan - to eliminate it entirely for a while to see what happens, then slowly reintroduce things to see if I get any reactions. Besides the IgG test some of my own observations were acute reactions in my mouth from certain cheeses, and things like that - so I'm certain there's some kind of allergic reaction to... something going on. (The test I took specifically did show that casein was the problem in my case. We'll see.)

And agreed that stress can cause those issues with the gut - and for me at a minimum exacerbates other things already going on - but yeah, I'm seeing and hearing a lot about how it goes the other way but I'm not seeing the science or experiencing it yet in my case.

Also - in my situation the autonomic dysfunction has a strong biological component. I have postural tachycardia and peripheral neuropathy caused by a genetic collagen issue (Ehlers-Danlos), so I know that there are major physiological factors going on and contributing to all my various issues. And then stress - which is aggravated in my case by wildly fluctuating heart rate - compounds all of that, creating a whole vicious cycle of impairment. Unraveling this whole web and picking away at parts of it at a time is my current challenge. But I am pretty confident that while depression contributes in some ways to my fatigue, it's also majorly impacted by my heart rate and probably some adrenaline issues common in Ehlers-Danlos.

(I appreciate this discussion and your thoughts, by the way.)