My eyes are yellow colored?

I woke up this morning and looked in the mirror and my eyes had sort of a yellowish tint to them. Not the iris but like the whites of the eyes. Is it some sort of dietary thing? Like am I eating too much of some particular nutrient or something? It's probably nothing but it's kind of strange. Also I was for some reason extra tired really nauseous and achy. I took some Tylenols for the aches but does anybody have any idea why my eyes would look like that?