Hi, gastritis is due to excessive production of gastric acid in stomach and sometimes infection like h pylori also. reflux of gastric acid occurs into esophagus which causes heart burn sensation. Usually antacids will give immediate relief. You can take antacids along with proton pump inhibitors will reduce your heart burn sensation. And take regular food at regular time, drink water, avoid spicy food and outside food, excessive coffee tea can also causes burning sensation. Take one ecg test, if it is not reducing go for endoscopy. Consult general physician for furthur evaluation and treatment.