Yup artificial sweetener is a huge cause of headaches... did it to me too. I will never have it again, so bad for you. I am trying to replace sugar in my tea with honey, its my only vice. I have replaced cows milk with rice milk which is ok. I'm doing some pre-detox detoxing! Apparently there is a Rooibos tea which tastes like black tea but fine on detox. I know I will feel better but ah... gotta get thru the withdrawls!!!