I have a canker sore :(

This is the first time having one. Actually, I didn't know they existed until last year.

It hurts really really badly. It's been 3 days since I noticed it and it seems like it's getting worse! What can I do to heal it more quickly.. I can't drive at night so I can't get any type of numbing stuff right now so are there any home remedies that will sooth the pain?

Where do canker sores come from anyway?
I have a canker sore :(
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