From Chocolate & Vicodin: My Quest for Relief from the Headache that Wouldn’t Go Away by Jennette Fulda:
It had been a week now. Seven days. 168 hours. 10, 080 minutes. 604, 800 seconds of pain. Constant pain. It gnawed on my nerves with formless teeth as I sipped my coffee. It flicked at my synapses as I sat at the computer clicking the mouse. It tap danced across my forehead out of time to the music playing in my earphones. Worst of all, it was a shiny object distracting my attention, a small child screaming, “Look at me! Look at me! Are you looking at me?!” There was no room for thoughts about plans for the weekend and what to eat for dinner. The headache was all there was now. It had started in my forehead and extended its tendrils outward until it encompassed my whole life.