I have been on this woe for about 3 weeks and have not had anything containing aspartame the entire time. Today while at a picinic type function I had 1 caffiene free diet coke. Now I have one heck of a headache, borderline migraine. I havn't had anything like this since I started, but I used to get migraines rather frequently in the past when eating all my junky food. Could this thing be a reaction to the diet coke?