Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that
diarrhea and stomach ache after eating out can be due to
Stomach infection also known as
Gastroenteritis caused due to eating contaminated food..
It can be due to bacteria, parasites, viruses, toxinlc chemicals etc..
I would suggest you to give him plenty of fluids and Oral Rehydration Solution..
Give him soft and semisolid diet..
Avoid fatty acnd and spicy meals..
Give
Tylenol to relieve pain..
Feed him with more of foods like rice and Yoghurt, banana, cereals etc..
You should consult a Paediatrician in case if there is no relief and he can advise investigations like Blood tests, stool tests and as per diagnosis he can be advised anti diarrhea Medication, antibiotics for bacterial infection and anti parasitic Medication like
Ivermectin for Parasitic infestation..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.