What can cause me to have sharp chest pain associated with high left side back pain up into the back of my neck sometimes causing a headache?

Heart Disease?: With the limited information, the foremost concern would be a heart condition such as angina. I would recommend that you get evaluated as soon as possible. It is possible you have cervical spine or a muscular cause for your symptoms, but these conditions are not life-threatening. Please get a cardiology evaluation first and make sure you don't have symptoms related to heart disease.