Hang in there! Don't give in to those cravings! They do pass :) For me day 3 and 4 were the hardest, the withdrawal headache was horrible, but what I did on those days was to eat small frequent snacks of fat/protein and drink LOTS of water.
Keep in mind that on the other side of this discomfort is freedom from those cravings and constant nagging urge to eat.
If you get a headache take something for it, it's just a couple of days of discomfort that is worth the benefits of commitment.
Also, people are very creative when they have to be. There are tons of recipes on the web that someone has figured out how to modify their favorite foods to fit the plan. You will be surprised that you really don't have to give up as much as you thought you did.