could be blood sugar, coild be high ammonia from the HCV, could also be TIA's caused by neurohepatitis or encephalitis brought on by the disease. Could also be HCV causing changes to your pituitary and thyroid function.
and about a dozen other things.
you will need to have test run to get to the bottom of this, and also are you treating, have you treated, and if not, why not? Do you have a liver doctor yet??
merrybe
Have you been tested for Hypoglicemia ? HCV can cause many things espcially brain fog and confusion if you have had it for a while I have boughts of confusion they come and go and I feel weak and suffer from fatigue I have had HCV for a long time but was just diagnosed I am also Insulin Resistant
Hypoglicemia can make you pass out diet and medicine can correct it Just a thought but you do need to figure out what is going on Maybe others have a more educated insight as your condition needs attention
best of luck to you
Baja