Die off and tooth pain?????

Hi,
YOU KNOW THE WAY THEY SAY ROOTCANALS CAN BE PROBLEMS AND ALSO THAT METAL FILLINGS SHOULDN'T BE NEAR GOLD CROWNS BECAUSE IT CAUSES IT TO LEACH MORE? WELL, ALL THIS HAPPENED TO ME AND I HAD A METALLIC TASTE IN MOUTH AND 3 FAILED ROOTCANALS THAT GOT ABCESSED 3 YEARS AGO WHEN ALL THIS CANDIDA STUFF HAPPENED. I HAD THOSE REMOVED, THE METAL TOO. PROBLEM IS ALTHOUGH I THINK IT HELPED BECAUSE FOR THE FIRST TIME EVER I FINALLY GOT DIEOFF BUT WHEN I WAS THAT CLOSE TO GETTING RID OF THIS (TWICE) ONE LAST TOOTH THAT I HAVE A ROOTCANAL IN STARTED REALLY HURTING ME....
I DID RESEARCH AND FOUND THAT THAT TOOTH IS ALSO RELATED TO INTESTINAL PROBLEMS ETC... SO THE QUESTION IS, BEFORE I DO THE NYSTATIN THAT TOOK ME MORE THAN 2 YEARS TO GET, SHOULD I HAVE THIS TOOTH REMOVED? IS IT WHAT IS CAUSING SUCH STUBBORN CANDIDA OR WAS THIS JUST A SIGN THAT THE ANTIFUNGALS/DIET WERE WORKING AND THAT IS WHY THE TOOTH GOT PAINFUL. DOES ANYONE HAVE INSIGHT?????