I, too, have regularly occurring episodes of chest pain, usually left chest/midsternal. The first two times it sent me flying to primary dr. for 1. an EKG and 2. a complete cardiac workup including stress test and echo...... and surprise, surprise!!!! Normal.
So now, when it happens, I just get my heating pad and enjoy it. All the while telling myself at least I know it isn't my heart. Heart pain, angina, unless it is a heart attack, usually goes away with rest. My chest pain is often worse AT rest, since I have such muscle weakness on a good day I am not very active. And when my rheumy poked, I had some tender spots, and it was blamed on inflammation. I cracked a rib coughing two years ago when I had pneumonia and often the worst of my chest tenderness comes back in that area.