My whole right side of my stomach hurts?

Abdominal pain: Abdominal pain has a very large number of causes, and without a detailed history and exam, you are not going to get a valid diagnosis over the internet. Please see your doctor.

Appendicitis: You need to go to the emergency room ASAP to be checked for appendicitis. You should not take a chance on this condition. Right lower quadrant pain is suggestive of appendicitis. Right upper quadrant pain is suggestive of Gallbladder disease.

Depends on details: A simple tummy ache with symptoms like nausea, vomiting, or diarrhea, whether at home or traveling, may be from a viral or a bacterial infection, or contaminated food. A normal person, not pregnant, not on medications, usually recovers easily. Taking a Pedialyte popsicle or 2-3 oz of Pedialyte hourly, plus drinking or eating little else, may settle things down. Otherwise, a Dr. should evaluate.