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.