Im 70 yrs old in July. Had a heartbypass in 2004. Have had undiagnosed pain inside of of rib cage since the surgery. Has spread all across my chest and the pain is 24/7. I cant use my left arm for anything. Just swinging it will make the pain worse. Havent slept more than 4 hours max for several years now. Been an awful life. What kind of doctor do I need. Had several cat scans and x-rays with normal outscomes. Been getting worse every year since the surgery.. any ideas ?