It is difficult to determine the exact cause of the symptoms such as abdominal pain and gas. It could be due to various reasons like food poisoning, a virus, or something else. Encouraging the person to stay hydrated by drinking small amounts of liquid every 5 minutes can help. Taking Tylenol may help with abdominal pain. Eating light foods like soups, toast with butter, eggs, and crackers is recommended while avoiding heavy or sugary foods like red meat and undiluted fruit juices. With time, there should be a gradual improvement in the symptoms. If there are any other questions, feel free to reach out.