I don't think you can do anything except wait it out. We got hit last September - it started abruptly Thursday afternoon and ended just as abruptly Tuesday morning. I was frazzled the whole time, but they finally just left.
The only thing we did is my server guy installed a script that banned IPs if they were hitting the server too much in a short period of time. All this really did is make it so my users could finally get onto the site, but the site was working very, very slowly.
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