What is the cause of a stiff neck?
Things like a stiff neck are normally started by sleeping or sitting at an awkward angle and should ease off with pain killers. They can also be caused by being stressed and your body tensing up which can happen without you realising it. It could be you are now worrying about it which will cause your stiff neck to continue. I would go to the doc and explain how often it happens and they may give you some painkillers which will ease the pain and let you relax. They could also check to make sure there is nothing else going on.