Thanks for writing your query.
It will be helpful if you give some details of your stool.
Flagyl contains metronidiazole, which is an antiamoebic.
You can add antibiotic like Ciprofloxacin
500 mg alongwith it. Also add a probiotic
Abdominal cramps can be controlled by taking antispasmodic like Dicycloverine
along with pain killer like Mefenemic acid and antacid Omeprazole
You should start your treatment after discuusing with your doctor.
If the problem persists, get yourself examined medically.
I hope this is helpful to you.