veg food must have been spicy and oily.
it may be gastritis or stomach ulcer.
it occurs beause of spices and acidity by outside food.
in food poisoning there is vomitting and diarrhoea associated.
Next Steps
take high fibre diet( salads ) and curd/ milk.
more of liquids...porridge in lunch/dinner
Health Tips
avoid spicy food for next 3 days