My daughter has been complaining of not feeling well for two days. Her stomach feels full, but she is very hungry because when she does try to eat she feels worse. She keeps having to go to the bathroom several times an hour. In the last 24 hours she had a handful of dry cereal, a bite of mashed potatoes and a dry biscuit. There's no fever, constipation, diarhea or vomiting. She is almost 13, in good health with average weight. Please let me know some possibilities to help her - thanks!