My dad had this. The pain came on suddenly and took a grown man to the floor. He was screaming in pain. My mom called the doctor and the doctor canceled all patients and came around with his bag. He injected some morphine and the pain went away.
Then they did the checks over the next few days to see how big the stone were. It turned out he had passed all the stones so no need for an operation.
Thailand's doctors are just monkeys in a gown, so who knows what they will do.