In my opinion you are suffering from gastritis
and heart burn itself.
Make sure the pain you are experiencing is not associated simultaneously with nausea, chest tightness
, sweating. Or the pain doesn't move to left arm or neck or jaw.
Dietary modification like avoiding carbonated drinks, having your breakfast, lunch and dinner at regular times can produce improvement. You should also avoide smoking and alcoho.
I would advice my patients an H2 blocker drug like Ranitidine
as first line(if not allergic to). If not relieving you mave have to start one of the group Proton Pump