Have you tried working the shoe angle? I have had chronic pain in lower left thoracic and left upper abdominal for 10 years. They have called it chest wall pain, and mostly were puzzled as to how to deal with it. It is most likely due to some scar tissue post op. During the day the pain is fairly low 2-4 generally. It increases when I exercise or walk or stand up for a time (I need to sit down after a few minutes unless I am using some support like a shopping cart.) I wake up from it at night. It is probably connected to some scar tissue. Generally stretching helps. Well, I lately pulled out some MBT shoes I had not used for a long time. They have pronounced rocker soles, and change one's posture and the muscles one uses. It created almost instant change. The pain is milder and less disabling. I am able to stand comfortably for a much longer time. Pain at night has diminished considerably and wakes me up much less. I was very surprised, and I hope this maintains. Note that the new MBT shoes you might buy are not necessarily as good because the company was bought up, and some of the new shoes are not constructed in quite the same way. Look for shoes with good rocker soles and support, that use the original MBT technology. Do not use if you have balance problems though.