I feel for you …. Mine start in my back than wrap around my ribs than into my chest …. So I hear you I think the worst at times like something else must be wrong …. But I stopped doing that …. I tried massage but makes it worse…. So my chiropractor found the right plan she does cupping which my body responds to well and I also use pemf mat this I find has helped me the most jeep under control…. I find once I am in a flare up takes a bit to get under control…. Like right now I am in a flare I know exactly what brought it on I was playing a game with my granddaughter where she falls back into m arms well that’s all it took …..I rented the pemf for the month after 1 week pain is not as bad using mat and pain is just in my shoulders and back has wrapped around ….without mat my flares last months ….so if you have never tried look up pemf mat this is the one I use.
Good luck

Bless you sweet lady! Costocondritis is very painful. When you press on your breastbone is it sore? Does it hurt when you lean against something like at your kithen bar and your chest hits it? Mine did not go away over night and I have a little flare up right now. Mine started years ago before fibromyaglia. You can think its your heart because of the location. Exercise like swimming can actually make it worse. I had a dear friend at church that went to a cardiologist thinking it was her heart. She had started back swimming and the exercise of swimming brought hers on....it was not her heart. If Costocondritis is coupled with GERD it is a perfect storm for pain. I'm so sorry you are battling this. I wonder if a short steroid taper would take care of the inflammation for you....either Medrol taper or prednisone....ask your doctor. It's worth a try if you can tolerate steroids. I understand. This stuff is very painful and I am so sorry yours has lasted so long. Look up also Teezy Syndrome.....they resemble each other. Hugs & Prayers for you.