"Exhaustion was more like the collapse on the couch with no will to get anything done-type. Funny you mention hiking because I hike a lot. But it would throw me into a tailspin, I suspect adrenal issues were involved as well."
The catecholamine neurotransmitters are made from tyrosine. The lack of dopamine is associated with ADD. ( have inattentive ADD.) If you can identify with the ADD symptoms, you should consider getting checked for cadmium. It seems that most folks who have hi-norm or higher Cd also have ADD or Cat. depression symptoms. http://www.amenclinics.com/clinics/information/ways-we-can-help/adhd-add/
The lack of another cat. neurotransmitter, norepinephrine seems to be associated with lethargy and what you seem to describe. (cat. depression?)
I also don't do well when I physically exert myself while on round. I'm fine while off round but was not before I started taking a pile of supplements, including generous amounts of minerals. I have not been exercising much since I started chelating because I used to exercise on the weekends. Now I chelate on most weekends.
I agree that it is probably adrenal-related.
In the yahoo groups we don't hear about really nasty sfx when folks just used chlorella; however Cutler says he's come across some people who got bad batches of it containing arsenic or bismuth. It is the cilantro, IV and large infrequent dose DMSA--challenge tests--that seem to cause most of the nasty reactions in folks.