Hello and welcome to HealingWell.
I am glad to hear you have had good reports from your Doctors. Have you discussed anxiety with your PCP? Anxiety may be at least part of the problem causing the disturbing sensations in your chest.
However, there is something else to consider with that, and that is that anxious people tend to breathe in faulty ways as well, which can often cause chest discomfort, because it not only strains the accessory muscles (those between the ribs and at the top of the ribcage, between the shoulders and the neck), but also can irritate the cartilage between the ribs.
The next time you start to feel anxious you may want to try the following:
Find a place where it's quiet.
Sit in a straight back chair with both feet on the floor or lie on the floor with a straight spine.
Begin inhaling by expanding the abdomen (let it inflate like a balloon), then move the breath into your rib cage and, finally, all the way into your upper chest.
Exhale by reversing this action; begin at your collarbones and exhale down through your rib cage and into your abdomen. Contract your abdominal muscles as you finish exhaling.
You might find it helpful to lightly place your right hand on your abdomen and your left hand on your rib cage to help direct the breath on its journey.
Begin by practicing for one minute and then gradually lengthen the practice to five minutes.
This technique helps to eliminate shallow chest breathing and encourages full exhalation and inhalation.
Once again, there's no need to push yourself or judge yourself for being anxious. The idea is simply to be quiet for a short time and notice your breath.
HealingWell is neither intended nor implied to be a substitute for professional medical advice. I wish you the best and do keep talking with us.