Why am I so tired?

So ladies my period should be here either today or tomorrow but I am literally exhausted. I have NEVER been this tired before. I slept lastnight for 7 hours & then I woke up & had eggs, a peanut butter chocolate chip muffin, & another small pastry for breakfast but now I have no energy. I know eating the wrong foods can cause you to crash & burn early in the day but I typically eat like this, although I don't have pastries but I usually eat a lot worse. I'm talking fried chicken, a slice of pie, & a bag of chips for "breakfast". But today I am just unusually tired. Do you all think that this could have something to do with food, my period, or maybe not my period coming. Idk