Thanks for writing your query.
After reading your post, it seems that you might be having an infection of the gastrointestinal tract and needs medical management.
You can take an antacid like Omeprazole
40mg once a day before meals along with an antibiotic like Ciprofloxacin
500mg twice daily along with Metronidazole
400 mg thrice daily.
will have added benefits.
You should eat light meals prepared under hygienic conditions.
Also take care of your hydration.
I hope this is helpful to you.