Hello I had gone through your question and I can understand your concern I see such patients in my clinic routinely and I will try to help you as well in best possible way looking at your history this could be due to any of following GERD, gastritis, acid peptic disease, this could be related to stomach hyperacidity or ACID REFLUX in my opinion you should avoid fatty fried spicy and junk food or carbonated drinks lead a stress free life just relax and enjoy your life omeprazole group of drugs with antacids will definitely help you if persists even after all this please consult a gastroenterologist for endoscopy or an scan study Hope this addresses your question please feel free to ask for follow up questions i will.gladly answer you wishing you good health