http://psy.psychiatryonline.org/cgi/content/full/46/2/142
Basically fatigue is a side effect of depression. This article shows a higher rate of depression for asymptomatic Hep B carriers.
Last year I was on anti-depressants for a while for another issue. I did have alot less fatigue then, but I discontinued the use since I didn't like the side effect of reduced sexual libido.
I also read an article saying that fatigue may also be from a response your body learned when the disease was active. That means it reacts because it has 'memory' of the active disease. Its not unlike those people who can still feel their amputated limbs. The solution is to retrain your body and antidepressants are one method.