Why do I have a very sore / stiff neck and shoulder pain? I woke up this morning with right sided shoulder pain, and it is very incapacitating! The pain is worse when I turn my neck in the direction of the pain! There is only stiffness when I turn my head away from the sore side. Initially, I was a bit nauseated. I am a 72 year old female. Yesterday, I was in the Emergency Dept with chest pain, diagnosed as Artial Fib! I was given Procainamide and the med. worked and my heart is now, good! (No previous heart problems!) However, I have had neck problems for years after a car accident when I was 31 years old, and 8 & 3/4 months pregnant. My car was rear ended and my baby in utero was and is just fine! I have not taken any painkillers. Should I be heading back to the Emerg. Dept for a checkup?