hi. noted history of gallbladder surgery several years back and discoloration of stools. some things to consider are stones recurring somewhere along your hepaticopancreaticobiliary tree area, where your gallbladder was previously situated. it is best if you do a follow-up consult with your surgeon, for physical examination and clinical evaluation.. diagnostics (such as ERCP, ultrasound, liver function tests, bilirubins, etc) and management (medical and/or surgical if indications are found) will be directed accordingly. hope this helps. good day!! ~dr.kaye