Hello Lybrate user,
It is an acute gastritis
that you have.
You can take ;
ARSENICUM ALB 30. 4 pills every 2 hours.
It will be easily available at any Homeopathic pharmacy around you.
Since it is quite late, you can have a simple paracetamol
) before bedtime. You should also take ORS or ELECTRAL powder with water if you have a loss of appetite and vomiting.
Avoid eating any oily or spicy food.
Take a bland diet.
Do let me know if this was helpful.