There are many books out there about low blood sugar (hypoglycemia), my favorite of which is Low Blood Sugar
and You, by Carleton Fredericks.
Hypoglycemia affects the workings of all our glands, our minds, our sleep rhythms, growth cycles, our very brains and thinking.
SassieLassie, I had similar test reactions. So humiliating and embarrassing; very much like panic attacks. As far as your last sentence, though, I've had a couple of really nasty supervisors...