hi, thank-you for providing the brief history of you. A thorough musculoskeletal assessment is advised. As due to the any of this you may get this symotims * costochindritis * lung infection * gastritis. As the history suggest the pain is in the chest, back and stomach region along with shoulder than a musculoskeletal assessment is advised. by which ruling out the causes for shoulder pain is possible . Also , taking a chest ray is advised to see the lung and bony issues if any is present. To recommend you for the same issue performing regular breathing exercise will help you ease of the problems. Perform breathing exercises like - * deep breathing * costal breathing * abdominal breathing * diaphragmatic breathing * pursed lip breathing exercises Please to keep a hand in the area of pain to avoid the elevation of pain and improve the strength in the muscles of respiration. In my clinical practice I find cases more of costochindritis and gastritis. and with proper physical therapy the and pain symptoms are lwoered. Strength is also achieved faster. Regards Jay Indravadan Patel