@joann... It is frustrating to have so much pain and be told it is not your lungs. I had chest pain running around my bra line and in my back and breast areas. After having many heart tests, it was still up in the air. My acupuncturist treated my nerves which were highly agitated and made me cough twice as much as was necessary to remove mucous. It worked. I only cough after nebulizing twice a day. I, too had gastric issues with a hernia and had fundiplication surgery. That helped, also.
Don't give up your search. I agree with irene5, start with your PCP and demand consults with specialists to rule out other issues.