i m 34 yrs old ,smokoing from last 14 yrs. from last 1 year i have a persistance pain in my chest (left side),back,left hand and shoulder. i ve got my medical check up by a Dr. in last august ,he has done my chest X-ray,E.C.G and blode pressure etc.but nothing has been findout,he said it must be a muscular pain or something like gas. but, its not setteledown yet. please help me .