chronic pain shoulder and upper arm

I was in a car accident 4 years ago. 1 year later i had a discectomy on my 3rd disc and a fusion on my 2nd and 3rd vertebrae. This stopped the pain between my shoulder blades however, it feels like my shoulder never healed. I have an aching pain constantly in my left shoulder and upper arm (from pain level 1 to 10, this is a constant 5). The skin is extremely tender on all of the left arm and my palm and little finger are numb and tingly. Although I do not have any restrictive movement in the arm and shoulder, it hurts all of the time.
I told my ortho surgeon but he said he does not know the cause (no interest really), I got a second opinion from another ortho surgeon but he did not know either. 2 MRIs and 10 xrays do not show anything. I had gone for treatment to a chiropractor prior to the surgery and he said it may be a stress fracture or dislocation. If so, they should have healed by now. Might it be nerve damage or could this be connected to any of the damage to the cervical area of my spine? (3 discs were affected but only 2 required surgery). The surgeon also removed a bone spur if that is important. Please help I am going crazy!