Stomach Problems. A little too long.

Hi. For the last...6 months or so, I get a horrible burning like sensation in my stomach. Different things trigger my stomach problem. For example, some foods I eat. I once drank a glass of apple juice and was in horrible pain shortly after. I once took dayquil and my stomach immediately started hurting. Sometimes, the burning pain comes out of no where. I saw a doctor once. I was given Dicyclomine and Pantoprazole. The Dicyclomine seems to work sometimes, for the pain. I took the Pantoprazole when I could feel what I believe is gas traveling through my stomach. I will be making an appointment soon because the pain is very uncomfortable, I don't know when to expect it and it's been around a little too long.