Need detailed history for finding the cause.
Have you taken outside food.
Can be due to infection.
Next Steps
Primarily you can take poppy seeds with
sugar.After that chew 4-5 basil leaves(tulsi) on empty stomach followed by lemon and honey water.
This would control the situation.
After that you can consult a doctor for proper treatment by finding the cause.
Health Tips
Do not drink cold drinks.Avoid wheat flour today.just have curd,rice,khichdi.