Cluster Headaches

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I am having "cluster headaches". I went out of town last weekend for my anniversary and we had some drinks to celebrate. This of course invoked a headache which I knew it would. Luckily, it was mild. I noticed the next day though that I did not get any headaches. I have been getting 2-3 a day for about 3 weeks. So the day after that my headaches picked up again. So I had a thought. I decided to have a few drinks last night to test this. Today I have been headache free so far for the first time since that last time. Do you know why this might be?
Thanks,
Brad

 

[sydneyhayes]

and to clarify my question. Why would having alcoholic beverages, although may invoking a headache during, somehow the next day have me headache free in two seperate attempts?