>>Then last night I got a rush of Bing referrals, now it has slowed down.
Bing actually does that a lot. This is something I've seen from them for a couple of years now. One day out of the blue you'll get thousands and thousands of referrals from them based on 1 or 2 keywords, 50x your normal Bing traffic... and then it'll instantly go away.
I've never been able to figure out what that is or what it happens, but it happens to me about once every two or three months.
Anyway that's normal Bing operations.