Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
If it is only Gilbert's syndrome there is nothing to worry. It is a benign disease and it will no harm in any way throughout life. Serum bilirubin
will increase and decrease spontaneously and it will never be more than 5.Tiredness
may be due to some other cause or may be due to apprehension due to increased bilirubin
I hope I have answered your query and this will help you. Remain in touch and get-well soon.