I've noticed that on the days I fast (not eating anything for breakfast, or for breakfast and lunch), I'm fine as long as I keep busy. If I'm just sitting in front of my computer bored, then I just keep thinking about food.
I remember one weekend I was SO HUNGRY by about 11am or noon, but I had been pretty bored all morning. So I went out to my nearest park and did some trail-sprints and hiked around a bit and my hunger totally went away and didn't come back until it was just about dinner time.
Plus, I think it's not as bad if I eat a BIG dinner the night before too.
But I remember before eating primal, I'd get such a headache if I didn't eat something within an hour of getting up - I guess it was a carb-withdraw headache or something.