I suggest you to undergo laboratory test regarding this. Taking pain killer will not resolve the root of the pain but only to stop the pain for a moment but as long as the root cause is there, it is possible that it will get worst if no treatment done. X ray or Wikipedia reference-linkMRI will might help rule out the problem. Physiatrist or Physiotherapist will surely do some physical test to you but then just wonder why they did not give you any treatment regarding this.
I am sorry I can't advise you anything unless your laboratoy test results is normal. There are certain exercises that sometimes contraindications to some sorts of problem that we don't know yet. I will be happy to give you the specific exercises you need to regain the strength of your neck mucsles.