Pravachol Amytriptyline)
3) Exposure to toxic compoundss that makes oxygen unusable. Especially solvents (ex: benzene, 1 1 1-Trichloroethane, M.T.B.E, chlorine, etc.) and metals (lead, arsenic, mercury, cadnium, etc.) other toxic compounds include, Nitrous oxide, glue, ammonia, etc..)
4) Inflammation in the lower back which reduces blood flow to the nerves in the spinal column.