Hiya -
I'm on Day 10, Phase 1, and I had the headache for about 3 days. I actually increased my caffeine intake for a few days, because I was scared I wouldn't have enough energy without the carbs. Not true. I'm back down to my one cuppa per day, with Caf Free Diet Pepsi at lunch and lots of water. What worked for me for the headache was Tylenol, quiet naps, and hot chicken broth with chili paste and garlic. Probably any hot drink would suffice, I usually drink the broth for sinus-related headaches. The heat soothes your head, and the chili clears the passages. Garlic is good for everything.
Just my two - and don't worry, it will be over soon!
Solarmama