What Causes Persistent Abdominal Pain That Subsides On Taking Antacid?

Hi Doctor. For last one week or so, I get stomach aches everyday at around 1 PM which lasts for quite a few number of hours. I usually take my breakfast around 8 AM (Omlet, Bread, Orange Juice and Yogurt). The pain usually subsides after taking any antacid but doesn t get over. Please suggest. Thanks & Regards Mukund