" Adrenaline poisoning,’ one of my doctors had called these surges of anxiety that had troubled me since childhood. The doctors explained that, for reasons they could not understand, my body seemed to think it was in a constant state of danger. One of the specialists my aunt consulted explained earnestly that it was a biochemical leftover from hunter-gatherer days. I’d be all right so long as I rid my bloodstream of the adrenaline load "

― Deborah Harkness , A Discovery of Witches (All Souls, #1)