I went in on Tuesday for my final followup. The x-ray showed the stone was gone. I asked what's the chances of it happening again and he said 50-50. What can I do to prevent it? Drink water. What do I do if I wake up in the middle of the night with the same pain? Take my painkillers and call them in the morning. Unless I also have a fever. Then it's get thee to an emergency room.