YES acud reflux, gastritis and esophagitis CAN cause all your symptoms as i have had them for 40 years. Gastric issues are a huge MIMC of cardiac issues. all of the symptoms your having can most definately all be gastric. try the PPI's and see if they go away. google a list of acidic foods and try and stay away form ALL of them for a couple weeks and see how you feel. Nexium was always the best PPI for me. The flutters can be cause simply form stress, the shortness of breath si when the acid gets into your lung on the way up . VERY common. pain on the lower rib and bck very common for gastric issues, chest pain can come from an irritated esophagus for the reflux feels juts like a heart attack and cna also be esophageal spasms which feels juts like a hart attacks as i have had 5 heart attacks and also have esophageal spasms. the worse days are when you eat acidic and or BAD food which make the reflux worse. been doing this for 40 years. trust me i have had it all.