I would recommend rechecking the bilirubin level to confirm that it is truly high. When the unconjugated bilirubin is that high the condition is called unconjugated hyperbilirubinaemia, provided all other liver tests are normal. The two most common causes for unconjugated hyperbilirubinemia are haemolytic anaemias, and Gilbert's disease. If you do not have anaemia you most likely have Gilberts disease. This condition is not likely to cause you any problem and is associated with a normal life span. The unconjugated bilirubin in Gilbert's disease tends to increase with viral illnesses, and with prolonged fasting.