I don't know if you're in Houston, but you might be able to get this stuff called "Watermelon Frost" in one of the Chinatown stores. It tastes terrible...smells even worse...but I swear that it cuts down the healing time by at least a couple days. At least for me it does.
I really do feel incredibly, incredibly sorry for you. The absolute WORST PAIN I've ever had was the 20+ canker sores in my mouth at the same time. It happened on vacation 3 summers ago. Spoiler (lol I know I've posted that pic before, sorry if it grosses anyone out). And, I'm sorry for the OP, I really didn't find anything that helped the pain. It was so awful I went 10 straight days without brushing my teeth and took pain pills early every evening to knock me out. Didn't eat either, I was miserable because I was so hungry. My mouth could not handle anything touching it, even 100% bland foods. just by far the worst few days ever.