I Am Experiencing Back And Neck Pain That Has Lasted

I am experiencing back and neck pain that has lasted for over a week. I am having chills and sweats, alternately, my heart rate feels faster than usual. I have a headache, pain when I move my eyes, and am sensitive to heat and cold. Does this sound worrying? Also having muscle cramping in feet, calves and hands, so that I get a 'charley horse' spasm and cannot get the muscles to relax.