Hi I have gone through your query....
You have classic presentation of food
poisoning that is acute
gastroenteritis....
Cause could be.....
-bacterial
-viral or
-parasites
First start treatment with antibiotic like
cefixime for 5 days....
More water and fruit juice to maintain hydration...
Semisolid diet taken ...
Small meal taken with frequent interval...
For few days avoid irritants like ....
-tea excess
-red and pork meat like non veg
-sour fruit
-
smoking -alcohol etc....
Green leafy veg more for few days.
If no improvement stool examination for parasite done to rule out ameba , giardia, ascaris , tenia solium etc....
According treated by cause...
If still needed stool culture or USG done for further work up if
diarrhea not resolving after 5 days....
Take care....
Dr.Parth