My 12year old child is feeling like she is going to throw up only at night or late evening, never does, and then has bad stomach cramps the next day. she is also feeling more tired than normal. no fever. what is going on?

Some possible causes could include: Gastroesophageal reflux disease (GERD): This is a condition in which stomach acid flows back into the esophagus. Functional abdominal pain: This is a type of pain that has no known cause. Irritable bowel syndrome: This can abdominal pain, cramping, and changes in bowel habits. Anxiety or stress. The GP can also evaluate for inflammatory bowel or allergies/celiac