It is very difficult to speculate on this, but you may be right that it can be chostocondritis. You can read up a bit on Tietze syndrome which may become a chronic condition. I see you have been on some anti-inflammatories as well.
You are right, longterm antibiotics are not good for the body in that it also kills all your natural gut flora - so probiotics are necessary for at least a few post antibiotic course.
I hope you get this sorted out! Chronic pain can be debilitating.
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