Over the course of this morning I have developed a REALLY painfull neck, it's the the right side at the back, as it's got worse I have pins & needles in my right arm/hand.
Something's irritating a nerve. There's no way to work out what (could be disc (rare in the neck), joint or most likely muscle spasm) online. Take some paracetomol and ibuprofen if you can, get a heat pack on it and try to keep it moving. Then go and see a physio.
Definately sounds like nerve route irritation! If it persists and keeps bothering you get down the osteopaths chiropracter etc.. doesnt matter who as long as they are good.
I know of a good osteo in bristol if you want one!