My daughter is 10 years old, For the past two months, she has awakened around 3:00 AM complaining of severe stomach pain in the middle of her stomach. She then vomits until he stomach is empty. While vomiting, she belches and has loud episodes of flatulence. At first, I thought she was overfilling her stomach or having indigestion, but now I'm more worried because it has happened 4 times with each episode being about a week-2 weeks apart.