Hello... I feel a discomfort near the left upperback muscle. There is weakness on my left side and an ache/pain at the elbow. When I gently lean my head back, I feel a pinch nerve sensation or pressure in my neck (Guessing C6-C7, based on image and discomfort region)... Xrays were negative for fractures or other bone damage... Been this way for three weeks. One day able to do 20 push ups with ease, next unable to do one. Weakness on left side.