CAnkEr SoRe KiLliN' MeH?

i have a canker sore on the left side of my tongue, far back, and it hurts when i eat or talk really bad. i think i also have one under my tongue and maybe in one other place, but im not sure, i just feel pain all in my whole mouth. my throat has also been hurting, but that might be because of post-nasal drippge.PLEASE I HAVE SCHOOL TOMORROW IT HURTS TO TALK, PLEASE, ARE THERE ANY HELPFUL HOMEREMEDIES FOR CANKER SORES? I DONT HAVE LISTERINE BUT I HAVE MOUTH WASH! sorry i really need to knoww