I love the taste of wine

I love the taste of wine but have not been able to drink more than a glass… due to it giving me a raging headache. I am guessing it is the sulfites. I bought your 2011 Sauvignon Blanc… since the label said no sulfites added. I drank several glasses (no point in fibbing, almost the whole bottle), and to my surprise, no headache whatsoever. I am amazed. Thank you for making such a great wine at a great price. I will be a long time patron!