I WAS JUST PRESCRIBED AMOXICILLIN AND GENERIC FLAGYL 250 FOR

I WAS JUST PRESCRIBED AMOXICILLIN AND GENERIC FLAGYL 250 FOR AN INFECTION THAT WAS IN MY TOOTH AND I HAD IT CLEANED OUT TODAY AND ROOT CANAL. IT WAS PACKED WITH ANTIBIOTICS AND I GO BACK IN 2 WEEKS. MY QUESTION IS 1. I KNOW FLAGYL CAN BE HARD ON YOUR BODY, AND MAKE YOU HAVE A BAD STOMACH, 2. HOW LONG DOES IT STAY IN YOUR SYSTEM AFTER YOU STOP IT