Looked bad, and by the sounds of it he was lucky to have come out of it alive. Wishing him well.
He certainly did look a bit lit on camera Sunday. Just had back surgery not too long ago, so who knows given his history... the details will eventually come out.
Regardless of why/how, I hope he makes a full recovery. If he's needing extensive surgery, doesn't sound promising that he'll be back this season, but golf obviously takes a backseat given the gravity of what appears to have happened.