K, I see you did the tests and the result is costo-chondritis. See a chiropractor. Pain pills do nothing or any meds. It's a bone/muscle structural issue. Chiropractor will reset the ribs in the back aligning the cartilage attached to the sternum to become "straight". Unfortunately it's a life long condition because it is a physical/structural ailment not biological where meds can help you. If the condition gets worse, the pain can feel like a heart attack. I was diagnosed in emergency room as an adult. The doc said yes, the pain can mimic the feeling of a heart attack. Really it is the twisting of the cartilage attached to your rib. There are exercises you can do to ease the rib/muscle joints so they dont get "tight". It is when the muscles (between the ribs) and cartilage get "tight" from lack of movement/exercise that can inflame and cause the pain. As stated in previous post, I got it as a kid because I had a knock to the lower right chest sternum/cartilage area and never knew about this or how to reset it then. Had I known as a kid, I probably wouldnt have this condition today! Arghhh!!! Because as a kid, your bones are more malleable and can be easily reset whereas as an adult your bones, muscles, cartilage harden and "set" and takes much longer to reset or adjust by a chiropractor. Oh yea, easy to way to see if the ribs are "out" or moved out of place is use your finger and press your ribs in the front of chest individually. If you feel pain on certain rib(s) by your finger pressure then you need to see the chiro to reset them. He makes you lie down and cracks the rib joints in the back into place. You feel the effects immediately. You can breath much easier and the muscle pain from the cartilage twisting is gone!! If you have a severe case you may have to see the chiro several times and the muscles between the ribs may take 2-3 days to reduce from swelling. Hope this helps!