UK CAA.
Back in 1995 I was diagnosed as having numerous "small" gallstones. My symptoms had been incredible pain under my ribcage lasting almost exactly 4 hours.
Before I went for keyhole surgery the company doctor secured me 4 weeks leave in case I was one of the minority of people out there with a prolapsed gallbladder in which case major surgery would have been required. I had the surgery (keyhole) as an outpatient, walked out of the hospital that evening, and could have been back at work within a week. As it was i took the 4 weeks as it was over Christmas!
Post op. the most painful thing was an incredible ache in my right shoulder, apparently a by product of having your abdomen extended by CO2 gas, which presses on a nerve when you are subsequently deflated.
Small gall stones are the problem as they can pass done the bile duct, causing the pain. Large stones are to big to fit into the bile duct and will just remain in your gall bladder, and you may never know that they are there.
As ever seek professional advice.