Hello,
I have the very same problem, had suffered 11 years of the stones pain attacks, diagnosed by common bile duct's stones just 16 months ago, my bile duct had been cleaned by ERCP method, but then my doctor suggested that my gallbladder be taken out to eliminate any risk of future stones. However only 4 months after the ERCP and GB operation, I was recovered at the hospital again because of another stone pain attack, and this time they found 3 stones 7 mm. width each! My bile duct has been cleaned again by ERCP, now it's been a year since my second bile duct cleaning, and I have the pains again! So in my case at least it's not just a spasm, but the real reformation of stones!
I wanted to know why these stones are formed even though there is no gallbladder, and even though I consume very small amount of fat in my diet.