Drugs to relieve pain are never necessary. The coffee headache is an example. A time comes when it is not convenient to get the usual breakfast cup. Using nerve-energy in excess of normal production brings on enervation. Few people waste nerve-energy in one way only.
Food is a stimulant.
Overeating is overstimulating. This adds a pronounced auto-toxin stimulation to that coming from overstimulating habits, and completes a vicious circle. This accumulation of toxin when once established will continue until nerve energy is restored by removing the causes. So-called disease is nature's effort at eliminating the toxin from the blood.