L.M.
Hi Kristi,
It could be H. Pylori- that can cause serious heartburn and a swollen stomach. It's a bacterial infection that you can get via food, it's common in developing countries but you can also get it here. It's cured with a few weeks of antibiotics. They can test it with a biopsy or with a simple breath test if you drink this medicine, also with a blood test. Have you been on vacation to Mexico or the Caribbean? Or have you had any sushi or any undercooked meats? If it turns out to be H. Pylori (it's very common), have everyone in your family tested too because you can pass it back and forth to each other.