Rob - I am not a Dr. and I'm not dispensing medical advice, but I will offer this.
I've had elevated billirubin since high school, it's called Gilberts Syndrome. It's fairly common, up to 10% of the population and affects more males than females. Worst thing for me is fatigue when in times of stress.
Here's a pretty good link for info on Gilberts.
Gilbert's syndrome - MayoClinic.com
Read through the info, ask your Dr. what he thinks and PM me if you have any questions.