Sorry, but aside from making sure you are taking all the supplements, getting enough water, and doing the salt thing, you may just have to suffer thru it. From what I have heard, it's just your body getting rid of all the bad stuff. I finally woke up without a headache my 5th day on the plan. Stick with it, it gets better! 60 pounds later, a few headaches were a small price to pay.
Good luck, hope your headaches pass soon!