Twice.. Supposedly. Woke up in the middle of the night literally thinking I was about to die. In all seriousness, I was really scared. Even after two surgeries I had never felt anything like that. Rushed to the ER, my wife told the doc my symptoms, he asked me if I had vomited, and just as I was opening my mouth to say "no".. I puked all over the place. Anyway, an MRI showed no signs of stones but the doc was pretty confident that's what I had. Second time was easier because I recognized the pain and knew what was happening. Still nothing showed up on the MRI though. It's extremely painful bro. I feel for you.