Bar, some days are harder than others, and the first couple of fasting days are often the hardest. I started last August and have lost 38 pounds so far. I figure with this, I can put up with being hungry 2 days a week, whereas with daily calorie restriction I was hungry almost all the time and could only lose about a pound a month. Some fasting days I really don’t even get hungry any more, but on most I do, at least for a while; the hunger eventually goes away once my stomach figures out I’m not going to feed it. Distraction helps. For some reason moderate physical activity, such as taking a brisk walk, helps. Just knowing it *will* eventually go away helps. Of course, once you see results, it’s easier to keep going, because you know it’s worth it. I’m not sure about the headache, others may have more advice on that. Fresh air might help. Hang in there, it’s worth it!