Main pancreatic duct dilated mildy.

Hi My father got a pain few days back at that time he got a pain in abdomen and back So we admit him in the hospital got acute pancreatitis due to bile duct stones and multiple stones in gall baldder after that doctor do some test in that test we find a jaundice , and cbd stone 4mm and multiple stone in gall bladder His full abdomen swells Lipase were 520 and amylase were 1739 and sugar is 219 , bilirubin is 2.20 after that they do test everyday in which we saw everything is come to nearly normal so today 20/04/2022 (after 3 days) Reports are bilirubin is 1.58 Serum amylase is 80 Fasting sugar is 89 ( doctor stop to check sugar as it always comes to normal) doctor advised to do ERCP for bile duct stone removal and check for MPD dilation on head , neck and proximal body i.e 4mm in measure I'm worry about it. Please tell me Please