Hello Good Evening,
This might be related to stomach and 
duodenum, like gastric or duodenal ulcers, now associated with a viral/bacterial infection.
You did not describe about your habits like alcohol or 
smoking because you could be suffered from gastric or duodenal ulcers which can present with atypical symptoms also, like you feel, but later on they can convert into burning sensation and pain.
So go for a UGI 
Endoscopy to rule out any 
Gastritis or duodenal ulcers, but there are strong chances to having these, so you will find definitive diagnosis and treatment.
Your medications should be follows:
1. Tab. Ofloxacin+Ornidazole/Ofloxacin-Cefixime
2. Cap. Pantoprazole+Domperidone
3. Cap. Lactic acid bacillus
But exact management will be decided by your GP after go through your investigations and clinical examination.
For prophylaxis you should:
-avoid unhygienic and raw food, contaminated water; 
-keep habit of proper hand washing before food and after defecate
-keep good sanitation around you.
Regards,
Dr. Naresh Jain.