I get real bad pain in the middle and right side of my chest when i lay on my left side i also have had it not laying down just not as much?

See MD ; get Xray: Positional chest pain usually originates from the muscles, ribs, or cartilage of the chest wall. In this setting, there is often a recent history of trauma. If there is fever or cough, it may indicate pleurisy with pneumonia. If there is shortness of breath and if the pain is worsened by breathing, one should consider pulmonary embolus or pericarditis.