Thanks for your question on Healthcare Magic.
I can understand your concern.
First of all rule out
pregnancy by urinary pregnancy test. If this test is normal then no need to worry for pregnancy.
Flagyl is having
metronidazole. It is antibiotic used to treat
diarrhoea.
It is having side effects like
gastritis, nausea, loss of appetite, bad taste in mouth etc.
So all your symptoms are mostly due to side effects of metronidazole (Flagyl).
So you can stop it if diarrhoea is subsided.
Take
pantoprazole and levosulperide combination for gastritis and nausea.
Drink plenty of fluids orally.
Don't worry, you will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.