You know something funny Merry, I have a relative who is a Dr. of Internal Medicine and he told me a few years ago that it was Costochondritis that he thought I had. I have mentioned this to a lot of Dr's. maybe 5 and they did not concur that it was Costo. They have not given me any answer as to what this pain really is. I will for sure pursue this though and I thank you for mentioning it to me. I will be having blood work done soon. What should the Dr. be looking for in the blood work? I too hope that the breathing machine helps me, but I have my doubts. I think you can understand.