I am so sorry you are in so much pain. I am not a professional but suggest you look into Slipping Rib Syndrome. It typically involves pain in the front but many people only have back pain. It is rare and often goes undiagnosed for years,
It can be debilitating. . It does not show up on an MRI or regular CT. The CT needs to be converted to 3 D for the cartilage to show. It is basically when the false ribs 8-10 are disconnected from the cartilage that connects them to the sternum. Just a suggestion. There are multiple Facebook groups that provide a great deal of information and people on there can also convert your CT into 3D if you choose to investigate. I wish you a clear diagnosis and comfort. and all the best. Again, just an idea but there are corrective surgeries.