Margit was only 19 when the horrific headaches began. In the middle of training to become a physical therapist, she found that the right side of her head began pounding, as if her skull were about to explode. For a while that first time, she muddled through the day, doing her best to ignore the pain, made worse by the blinding artificial light and stress of the clinic.
But eventually she went home, pulled down the blinds and fell asleep on the couch. When she woke up—15 hours later—she felt weak, but better. Perhaps it was just a fluke.