An optical fiber link module adapted to receive a fiber optic cable. The enzyme electrode of the present invention further includes a high-resistance particle enhancing an electrical resistance, the high-resistance particle being chemically stable. Using glycerophosphates, a method is provided for alleviating, palliating, and reducing the syndromes and conditions of discomfort resulting from a variety of diseases, including irritable bowel syndrome, interstitial cystitis, inflammatory bowel disease, fibromyalgia, urinary urgency, benign prostatic hypertrophy, vulvodynia and external genital pain.