Looked bad, sounded bad: it's not good when someone falls off a stage head-first. But he'll be okay:

You can tell it's an Australian writing this, because there's no article in front of "Hospital." The Brits say the same thing. "He was taken to hospital." Why not just dispense with all the articles? "Buffett was released from hospital after falling off stage during concert and hitting head on floor." Anyway, they did some scans, and there wasn't any damage. He might even make his next concert, scheduled for Saturday.

In case you're worried about whether he needs the money, and might be in trouble if he can't tour anymore, he's estimated to make $100 million a year from his various ventures. So yes, he probably paid cash for the CAT scans. And tipped the techs well, too.