I've got Gilbert's as well - found out about ten years ago during some routine blood work.

The only thing I've noticed is that dehydration hits me a little harder than most people. If I don't drink enough water throughout the day I get fatigued, and if I don't drink enough water after a night out I get pretty gnarly hangovers.

This is just comparing me to my peers though, and might not be due to my Gilbert's at all, but the fact that these things have been linked to Gilbert's in studies means it's possible they're related.

Anyway, staying hydrated never hurts, so thought I'd pass that along in case it helps you too.