Since winter break 2012 I have been getting heart burn off and on, usually minor, but sometime major heart burn. I have also had a burning sensation in my upper stomach/lower chest for the past couple of years. Especially in the morning after breakfast and at night after dinner my stomach feels very acidy and it feels like whatever I ate is not being digested. This sensation worsens when I lay down or run. I usually feel a loss of appetite until my stomach settles a few hours later. Usually, but not always, this sensation worsens with eating oranges, yogurt, eggs, drinking tea. I am really good physical shape because I run a lot, and I am very good about drinking lots of water during the day and eating a variety of foods. What is the problem with my stomach?
It certainly sounds like hyperacidity in the stomach lining (gastritis) with episodes of esophageal reflux. This can be caused by caffeine, use of aspirin or ibuprofen/naproxen, or alcohol. It can also be caused by a bacterial infection of the stomach lining.
We can assess your symptoms and make a recommendation of medication or other treatment/diagnostic procedures you might want to consider.