Horrible canker sore

Can somebody please help me relieve this canker sore or tell me if it is something more

I’ve had it for a few days and it is HORRIBLE

I have 3 around the same area but the one is worse than I’ve ever had before!

I’ve tried salt water putting tums on it milk orajel everything and nothing is making it stop hurting and I’m going crazy!!

Any advice is appreciated!