I see you are young. After ruling out viral infections, autoimmune disorders, familial conditions, etc are the next common causes. I advise you not to worry excessively about the small rise in bilirubin levels. Many people with liver disorders will live with symptoms or issues with bili levels of 15 & above for many years. Thanks to the highest regenerative capacity of liver. Adopt a healthy lifestyle and check bili levels once in 6 months. If rising beyond 4-5, consult a good family physician or a gastroenterologist. Udiliv only helps in cases of obstruction, I feel your case is different since GGT and Alk Phos were normal.