Hm. not sure and you've asked this of your doctor? How are your sinuses? I do think a bad headache, bit of pins and needles, etc. can be due to neck pain which can be due to back pain. Do NOT go to a chiropractor at this point. They are trained but not medically speaking at this point with your symptoms, I would make sure to see an MD doctor first for full evaluation.
Hello~I would continue to bother the doctor and tell them how you feel, sometimes, they will make exceptions and put you ahead of others that maybe are not as much as an emergency.
It definitely sounds "nerve" related, they can cause the numbness, etc that you are having, so probably the neurologist is the best place to start.
Another thought, it is a small possibility that your issues could be caused by a TMJ. (Temporomandibular joint) problem, they, too, can cause the numbness and facial tingling.
Perhaps seeing an orthodontist might be of benefit as well.
Here are just three of the symptoms:
◦Frequent headaches or earaches on one side
◦Dull aching pain in the face
◦Numbness or tingling in the face/neck region
I hope you get some help and relief soon.