Chest neck pain while shouting. Or what?

Hi I have been suffering from upper back just back of breast till neck area and too much at the left side since 6 months .I will have this pain so much in the morning and also when iam sitting or doing work when I lay on bed I don't find that much pain.sometimes I am having pain in my left breast the pain coming and going. From few days iam feeling pain and discomfort if I shout Is it related something to heart? In Aug I did hrct to rule out covid I was not having covid but it showed bilateral minimal plueral effusion and infective etiology I did nt pro bnp which is normal Cbp crp lipid vit b12 thyroid serum creatinine serum uric acid serum aec lft all are normal Except vit d3 which is 15 and iam on the supplement since January. Is it related to heart or what?I did eeg also which also is normal Plz help me out thank you .f27