What can I give him to help reset his stomach? Are there any probiotics or something that would help him feel better?

To help with stomach issues, you can give them probiotics or other remedies that aid digestion. It's recommended to focus on light foods like soups, broths, toast with butter, crackers, and eggs, while avoiding heavy or sugary foods like red meat and undiluted fruit juices. Gradual improvement should be noticed each day. Feel free to reach out if you have any other questions or concerns.