I am just writing to let know to ask your doctor about Fibromyalgia Syndrome or Chronic Pain Syndrome. I too have suffered for years with low back pain. With all and every test coming back NORMAL. I got so frustrated and talked to a friend that has many of the same symtoms as I and she has Fibromyalgia. Well i was just diagnosed after 3+ yrs. of pain with no explanation as to why. I just found out that i have Fibromyalgia and Chronic Pain Syndromes. There are many sites on the web that are very informative check them out and see if you have some of the symptoms that they list and ask your Doctors.