Yes, I had this for a couple years, getting so bad I couldn't climb a flight of stairs or walk 100 yards without sitting down for a rest.
It's an inflammation of the joints where your ribs join onto your sternum. As ibuprofen didn't work I was prescribed diclofenac which works well for many people and indeed was working for me except turns out I'm allergic to it (so if you take it and get D+V for more than a few hours, STOP taking it!)
Some months later I went back to the doc, saw a different GP who instead of saying there's two options (do nothing or anti-inflammatories), said there were three options. So I asked for option 3.
Turned out option 3 was to inject anaesthetic and anti-inflammatory directly into the joints. I begged for it and he was startled, then agreed, had to order in the drugs, and then did most of the joints. Didn't hurt cos only the skin has nerve endings. He did tell me to call 999 and tell them I had a punctured lung if I had any pain over the next few days...
It was a miracle cure. Actually I had to go back once to have some of the joints done again, but on the whole it's been fixed. I walked half a mile home without stopping!
The problem is finding a doc willing to do that, as usually they want you in hospital for it, or aren't aware it's an option.