Hi, please dont worry. Are there other right heart symptoms like pedal edema? They could be working you up to find out the cause for low O2 levels. Hope anemia has been ruled out. Certain systemic disorders like anemia, diabetes, vitamin deficiencies and thyroid disorders can cause these symptoms. Hope neck ultrasonography has been done. If there are problems in the bones it would have been picked up by CT scan. So, don't worry and discuss these options with your doctor. Good luck with your therapy. Regards.
I also have rib pain time to time