I had my gallbladder removed two years ago (lapchole), after six months I had stomach and back pains.?

The doctor found out that I had stones in common bile ducts and scheduled me for E.R.C.P. One year ped and experienced the same thing again. Performed another E.R.C.P. I was very depressed thinking that E.R.C.P might have complications afterwrds. Does anyone out there experienced the same condition? What should I do to prevent recurrent stones? Does it really formed in common bile ducts or in the liver? should I do gall cleanse to p out some stones in common ducts? need your help.