Hello melaniejg,
Start paying attention to anything else you may feel at the time your burning is happening. Any nausea, sweating, breathing difficulty, is it worse when you lie down, is it made worse with deep breathing or exercise (ie walking).
It is likely simple heart burn, but depending on your history, symptoms and clinical presentation, your doctor may want to follow up with more tests. I would just make an appoinment with your doctor so you won't worry about this. Let him be the one to make to make the call as to what is really going on.
Best wishes.
Acid Reflux ? do you get it after you eat, during the morning or evening?
sounds like heartburn or esphogus irritation/ could be hiatal hernia or beginnings of an ulcer/ see a doctor