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Presumably, if a patient wished to endure periods of unrelieved pain for the sake of clearmindedness, he could make such an arrangement with his physician. Otherwise, I believe severe pain should be treated with adequate doses of narcotics given at appropriately frequent intervals. See also Berris and Greenblatt (JAMA 1983;249:1708) and Sriwatanakul et al (JAMA 1983; 250:926-929).
Archer J. Narcotics, Pain, and Clear-Mindedness-Reply. JAMA. 1983;250(11):1392. doi:10.1001/jama.1983.03340110015013