Two weeks ago I have a severe sinus infection, the doctor prescribed some azithromycin, prednisone, and hydrocodone cough syrup, I only took the cough syrup twice, it was too strong and made me hallucinate. However, I now have a stiff neck that is extremely painful at times. It wakes me up in the middle of the night and I can't continue to stay in bed. Yet, when I get up and sit in the chair I am exhausted. The stiffness and pain is on the right side of my neck and head. When I cough it hurts worse. I thought it was a muscle and purchased some bengay; however that did no good. I've tried a heating pad, and pain relievers, yet the pain does not slow down or stop.