How the hell am I supposed to eat all that I'm supposed to eat?

So today I bought and started reading Barbara Luke's "When You're Expecting Twins, Triplets, or Quads: Proven Guidelines for a Healthy Multiple Pregnancy," and it is freaking me out.   It is supposedly evidence based, and is largely about nutrition in multiple pregnancies.  It is basically stating that one of the strongest indicators for carrying twins to term and having them be a healthy weight is the weight you gain in the 1st half of pregnancy (up to 20 weeks).  Apparently even though my BMI is a bit high (we won't say how high), I'm supposed to gain 20 lbs in the first 20 weeks. 

Now, this would be well and good if I hadn't been horrifically nauseated the 1st 11 weeks and not known that I was carrying twins.  Before this pregnancy I was trying to lose weight, and had lost about 20 lbs.  I was figuring from  everything I read that losing weight trimester 1 is cool, especially if you're nauseated.  So I am actually down about 4 lbs from my pre preg weight at 11 weeks.  If she is correct, this means I have 9 weeks to gain 24 lbs.  Oh, and I'm still nauseated.  The amount of water, protein, and sheer calories I am supposed to consume over the next few months is blowing my mind.  It SOUNDS good in theory to be able to eat 3000 calories, but aside from 1 serving a day of ice cream, I'm not allowed to eat sweets, starchy stuff, or white bread/pasta.  This means that I have to cram an unholy amount of meat, whole grains, and dairy into my body, not to mention the gallon of water and lots of fresh fruits and veggies.   All of this with feeling constantly like I have a low grade hangover.  I really just want to eat naan all day, frankly.  I am going to have to develop some kind of checklist to make sure that I get it all in.  I started trying today, and it's just making me feel horribly bloated and terrible.  Ugh.  But with the fear of preemie twins in the NICU over head, I'm going to keep trying.