Welcome to HCM.
It could be due to indigestion
,Don't worry it will recover it self.
If it is persistent than you have to think for medicine.
or ondencetrone for vomiting
Give complete course of norflox/metronodazole.
You have to complete albendazole/ivermectine course because he is farmer and regular eater of fruits and vegetable.
Consult your doctor for proper medical management.