I've never had canker sores in the back of my thoart, and I would probably hate it as much as you, perhaps more, if I ever got one. Sorry to hear about that, Ace.
Anyways, the thing I do to get rid of my canker sores is eating one serving of yogurt a day. It really does the trick for me. Gone in about 3 days.

Another trick I used once was putting baking soda on the sore. Of course, with it being in the back of your thoart, good luck getting it there.

Seriously now, just let me find a little book, and I'm sure I can help you.
I've got a little (that's actually exagerating on the fact that it's hardback and 500 pages.) book that holds home remedies for all kinds of common health problems.
Many of which, actually hold quite amazing results.
