Thanks for writing your query.
It would be helpful if you get your stool examined(Routine/Microscopic and for Occult blood).
You can take Metronidiazole 400 mg thrice a day along with an antacid
150 mg twice day and a probiotic
preparaton. Abdominal cramps can be controlled by taking antispasmodic like Dicycloverine
Antibiotic like Ciprofloxacin
500 mg twice a day, if needed can be added according to the report of the stool examination.
Take care of your diet. You should eat light home made food, prepared in hygeinic conditions.
Drink pure water only.
If the problem persists, get yourself examined clinically.
I hope this is helpful to you.