My 14 Yr Daughter Is Experiencing Bad Stomach Aches Whenever

My 14 yr daughter is experiencing bad stomach aches whenever she eats anything. She has been having pains all summer but just this past week it's been getting worse. Yesterday and today the pain started after eating a bite of cantaloupe. The stomach pain lasted for about 45 min. She also felt like throwing up. She also says it feels like the food is stuck in her throat. We can't pin point a certain food since it is all food. The pain is done low and is sharp and constant.