Thanks for writing your query.
After reading your post, it seems that you might be having an increased intestinal motility which is stimulated by food.
I would suggest that 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 after meals. A probiotic along with digestive enzyme
preparation containing pepsin and fungal diastase after meals will be helpful.
Eat light meals prepared under hygienic conditions.
I hope this is helpful to you.