Upper back stiffness and chest tightness

Hello Doctor, I am having upper back pain for last 4 months consulted ortho doctor they advised it is because of postural problem & muscle spasm. Going physio for muscle relaxation, physio said chest pain and tightness in chest due to upper back stiffness, while doing physio I feel relaxed but after 1 or 2 days pain is slowly coming back. While lying down Flat on floor getting chest tightness and pain,wen getting such feel I become tensed and worried of heart attack. Consulted cardiologist to rule out cardio issues I have done ecg, echo and tmt, chest x ray all comes out normal, cardiologist said nothing worry about heart issues just lifestyle changes and weight reduction will help to come out from it. After that also always thinking of the pain and heart issues, which made my day fearful not able to spend time with family no enjoyment. BP and Cholesterol wer there. Taking BP pills metosartan 25. Kindly suggest me what to be done further to come out from this issue.