In my opinion it's postural. As soon as I assume my normal posture for WFP I feel the neck is wrong. If I try to work left handed I get immediate relief but because of a neurological issue I have poor left side coordination and it doesn't work. Standing back doesn't help it seems - at least not now.
So how is a neck protect going to help you ? As an aside..........you remember all them neck braces you used to see from people with whiplash after car accidents, or even work related accidents. You don't see them any more. The reason is they don't recommend them anymore. I can understand the logic, your necks not broke, why would you need a brace of some sort. IMO same goes for a neckprotect. You really need a gadget to stop you from doing what you can do ?
If your answer is "yes", then not only will you have self medicated, you will have self diagnosed your problem. And that would be caused by looking up to high ? I'd seriously doubt thats the cause myself.
If i recall correct you're over 50 years of age? I think you'll find your problems are just age related. You will simply need to work a bit harder (as in exercise not WORK) to keep your neck and back in shape. Thats my experience anyway.