One week too late, Cod, but I buggered up my neck one day so bad I couldn't get out of bed, couldn't turn my head, just sat there shouting (very) loud and swearing (even louder). Wouldn't call 999 as I wouldn't have been able to open the front door, and we'd just had a new one made up and hung and didn't want it broken.
DW came back from work as I phoned in pure pain.
Got my mate Alex the Osteopath (North London) to come round as sharpish as he could and after half hour or so of loosening muscles around my neck he clicked and I was BLISSFULLY relieved.
Try an osteopath next time, or consider treatment 'whilst you are well,' so to speak. I thought it was all complete pants but afterwards I was truly grateful.