Hi. I'm A Chronic Migraine Sufferer. My Triggers Tend To

Hi. I'm a chronic migraine sufferer. My triggers tend to be high sugar food, weather changes, chocolate, menstral cycle, stress, and strong smells. I recently began trying carbonated water that is naturally flavored. Has no sugar or sweeteners. Every time I drink one, I get a headache within 10 minutes. What is it in the water that could be causing this? I have a regular soda very, very rarely and it doesn't affect me like the carbonated water does.