There's a strong possibility that this is caused by anxiety because of the distribution of the pain and the fact that you've had a negative test. You and your doctor might also consider alcoholic neuritis if there has been a large degree of alcohol consumption recently and chronically.
Have you ever gone to a chiropractor? All our nerves are connected to our spinal column. If your back or neck are miss aligned the bones will put pressure on your nerves and cause all kinds of problems. Just a thought as I am not a Dr., but a firm believer in my chiropractic care.
Did you take any anti anxiety meds or anti depressants? I have the exact same symptoms as you, with some others. After dozens of tests over the period of a year, I think it's a side effect and withdrawal symptoms of these horrible drugs.