Hi.
Thanks for your query.
Noted the history and understood the concerns.
Stomach pain can be due to many reasons including the one you mentioned like intestinal infection as you are in a new territory and food or water can cause this.
Since you have not mentioned about the stools it is difficult to guess the cause.
You can certainly take O2 Tablets as it is a combination of Oflaxacin and
Ornidazole which acts on intestinal infection.
For
severe pain in abdomen you can take an anti-spasmodic from local Pharmacy and see for the effects.
Also take Probiotics and a PPI like
Omeprazole.
Take plenty of oral fluids if there is no nausea or vomiting.
Take
Domperidone if there is nausea or vomiting.
Try to consult a Local Doctor as the medical facilities are available there and take a prescription based medications as advise by the Doctors. This helps to get a clinical evaluation and examination.
Hope I have answered your query.
Let me know if you need further assistance.
Dr T Chandrakant.
General Surgeon.