Hi
Welcome to the HCM
It seems that your child is suffering from a
gastroenteritis episode which is most likely due to parasitic infestation. Many a times children do suffer from these episode after a field trip. Don't worry. It can be easily treated. I would recommend you to go for his stool examination especially for ova and cyst.
Thereafter, you may take the following measures to help him:
1. Keep him well hydrated by regular feeds and oral rehydration therapy such as lemonade , soups or buttermilk etc.
2. Give him antiemetic such as ondansetrone or Domperidone along with antacids such as Ranitidine or
Lansoprazole. They will help by relieving vomiting.
3. For stomachache, you may give
Meftal Spas or Dicyclomine.
4. To clear up infestation, start
Metronidazole or Tinidazole with Albendazole.
Also, give a course of antibiotics if there are any infection suggested by stool examination.
Discuss the dose and duration with your treating
pediatrician.
Hopefully this will help you. I would be glad to help you in any further questions.
Take care