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The problem you are experiencing seems to occur only during your stay in your hometown, suggesting a possible connection to either an infection or a change in food type. It could be related to an Entamoeba infection, which is worth considering.
Additionally, milk allergy might be causing similar symptoms. I recommend observing whether you develop such symptoms after consuming milk and, if so, consider switching to a different type of milk. Cow milk is generally lighter and well-tolerated. Avoiding red chillies in your diet might also be helpful.
As a general health tip, try having lemon with lukewarm water every morning.
If the above measures do not bring relief, you can try taking tablet Metrogyl 400 mg (Metronidazole) twice a day for five days. However, it is crucial to consult a specialist doctor, discuss your symptoms with them, and seek their consent before starting any medication.