@happy@76, Good morning. What a great alias....except I think I beat you by 1 year......yep 77. I was attracted to your discussion title because I have just a bit of experience with that issue. I am going to assume you found the site (link below). It is very interesting. At the bottom of the page is a series of symptoms that are not costochondritis. For the most part, clinicians diagnose with patient feedback and because the diagnosis is one of exclusion may not appear to be knowledgeable.

And now to another set of symptoms that appeared for me and were attributed to a pretty severe reaction to Boniva (and other bisphosphonates). I eliminated a few possibilities like heart attack.....this was a bone issue (in my opinion)....from the ribcage and sternum up to the jaw and even the eye sockets. I was also having difficulty swallowing.....and I wanted to pull all my teeth out of my head.

My PCP discontinued the medication and I visited my Myofascial Release therapist for several treatments until the discomfort subsided.
Are you taking any osteoporosis medications? I moved to Tymlos and have not had a reoccurrence.

I am not a medical practitioner and can only relate the chapters in my book of experience that might shed a little light. I do wish your DR had been a bit more forthcoming if in fact, he suspected costochondritis so you didn't worry. May you be free of suffering today. Please let me know your thoughts. Chris
https://costochondritis.com/diagnosing-costochondritis/