Acidity plus burning sensation in mouth.

Around 2 and half months back I felt acute burning sensation in stomach which was felt in food pipe as well as in mouth . Later consulted a gastrologist who prescribed medicine plus endoscopy . Endoscopy detected corpus and antral gastritis , plus H Pyroli Infection . Was given medicine kit for 14 days which showed some progress in me with reference to the symptoms. Right after that was again put on medicine such as H2 Blockers and proton pump inhibitor for 15 days . As of current I am some what examining acidity plus burning sensation in mouth .Now doctor has again given medicine to be followed for 2 months . In the mean time I my self went for stool test for H Pyroli . Test came as negative . I fail to understand why am I still having symptoms like acidity, burping and belching plus burning symptoms in mouth particularly on lips .