Hello.There are sometimes microstones (microlithiasis) or even sludge that descend from gallbladder to cause acute pancreatitis and not found with an abdominal ultrasound, so I d have recommended a MRCP for a better diagnosis and in time of exacerbations still more sensitive. As for the remaining sequels after these recurrent episodes usually it s said that colelithiasis is not a cause of chronic pancreatitis because when found like a cause it s treated definitively with surgery. Don t forget about other causes(ingested medicines, high triglicerides, pancreas divisum, coledochocele, cystic fibrosis, sphincter of Oddi dysfunction i.e) that your doctor should exclude carefully before the diagnosis.