I had similar issues growing up, but without alcohol. Pop triggered it, caffeine free didn't matter, I got diagnosed with what I consider made up jargon, costocondritus? I don't have the paper work near me. But that was over 10 years ago. I still have the issues and it tends to flare up mostly when I drink. Sometimes it's straight booze sometimes a mix, sometimes beer. No consistency. Either way 14 years later from the first time and I'm still alive.