I contracted Shingles 7/13 which evolved into Post Herpetic Neuralgia , upper branch of Trigeminal Nerve above the eye one side . The Burning , stabbing , stinging , itching was horror , A small Lidoderm Patch enabled me to sleep somewhat along with a cool ( not cold ) water bag situated on the affected areas , more relief . My Dr. Rx'd Lyrica ( NO GOOD FOR ME ) , mood swings , loss of balance , abstract thoughts ( steer clear of that one $$$ too ) I stumbled across the " body's need for WATER " through a random search , nerves , Myelin Sheath , Brain 85% Water all need the daily required amount of WATER . Believe or not after continuous pain daily / nightly / sporadically it has Diminished greatly in just 4 days , no more coffee , sodas etc. strictly the daily required amount of water has HELPED ME A GREAT DEAL , 1 persons opinion , it can't hurt , water that is but DEHYDRATION sure can .