Fatigue, like whoa!

I'm 6.5 weeks and battling the world's worst fatigue. I had this with my first baby, but had the luxury of no kids and having off two weeks around Christmas to rest. On weekends, I'm sleeping 12+ hours w. naps and still feel wrecked! Weekdays, with work I can only manage 9hours a night and I'm so wrecked all day- it's like the world's worst hangover.