I can understand your concern but you have given very less history.
The site of the pain is necessary to be mentioned.
It could be gastritis, acute gastroenteritis etc.
Take a tab. Pan-l once a day half an hour before food.
Consult a physician in person for further treatment. You may require a course of antibiotics. And also certain tests may be required. Take a cup of curd twice a day after food. Have a soft diet.
Dr. Anil Kumar Jain.