Hi Welcome to the HCM I understand your concerns but don t worry. The most likely reason for these symptoms is a viral illness which easily spread amongst children. They do not need antibiotics unless and until blood or culture reports suggest a bacterial infection. Repeated antibiotics should be avoided. The need to development of gastritis, indigestion, antibiotic resistance. I would recommend a symptomatic management including antihistamine such as Chlorpheniramine or fexofenadine along with antipyretics. Give Lansoprazole for stomachache and associated vomiting. Hopefully this will help you. Take care