Kidney stones are second only to biliary colic for me. I've never fucking felt pain like it, and I've got a very high pain tolerance. I had an attack come on that was so bad, I passed out twice between bouts of writhing around on the floor like a worm, unable to even speak.
An emergency run to the hospital, 4 shots of fentanyl, and an ultrasound later, and it turns out my gallbladder was set to explode. Also turns out it'd been fucking rotting inside me for years, and a previous hospital stay failed to mention it in 2019 despite them knowing about it.
So FUCKING glad that's over now. Towards the end, merely drinking water would set off an attack.