Did you feel amped up or on edge in the PM hours on the day of the test?
Did you feel fatigue and lethargy on the day of the test?
I wonder if there is more of a downward spiral with several factors in play for many people.
These could involve weakness in adrenals and or the brain's control of them
A tendency towards anxiety due to imbalance of brain chemicals
A lifestyle or current life situation that is too stressful
Poor liver detox of chemicals that amp us up
Toxins and/or infections as contributing factors.
In the heavy metal detox groups we often see this combination of factors, probably because HMs affect so many systems in the body. Then you get hit with a major stressor in your life--loose your job, get a divorce, get a substantial illness, etc--and you start into the downward spiral.