I have pain in left upper back since 20 days, had swelling as well under the left shoulder blade. Pain is throbbing as well as pinching with an overall weakness in the left arm starting from palm to armpit. Feeling is causing discomfort in the left breast, armpits , upper back and complete arm. I am 33 year , old mother of 8month old baby and had issues with breastfeeding with limited feeding until 4 months of delivery with restrained milk produced from the left breast. I have hypothyroidism as medical condition.