What Causes Yellow Discharge While On Flagyl?

MY HUSBAND AND I USED KY YOURS AND MINE AND I GOT A BAD YELLOWING DISCHARGE EBCAUSE ROO MUCH OF IT GOT INSIDE ME. I HAVE BEEN TREATED WITH FLAGGYL AND AMOXYCILLAN 500 MG AFTER DOCTOR DID TEST AND SAID I HAD A SIGNS OF A STREP INFECTION WHEN THEY DID PAP TEST- I HAD NO OTHER DISEASE THEY COULD FIND. AFTER TWO TRETMENTS OF FALGGYL THE YELLOW ODORY DISCHARGE IS COMING BACK- BURNING AND I AM SO FRUSTRATED. FLAGGYL SEEMS TO BE THE ONLY THING TO MAKE IT STOP- BUT AS SOON AS I STOP FLAGGLY IT COMES BACK