Home memories for canker sores?

what r some things that can soothe my cankerr sore it hurts soooooo badly and i already tried saltwater, salt, water, and baking soda together and baking soda and water but none of it works and i cant go anywhere to get any medicine cause its sunday night so there isnt anywhere to get something but if u know any medicine for them then please tell me cause maybe i could ask my mom to go out and buy me some tomarow but i need some now please help!!