It must be the Bac (its great molecule, i know!)... and it must be something related... that i will find for sure... and then, obviously share ;-)
Such a big drop in alcohol consumption brings a lot of related changes with it. Your headaches might be one of the indirect changes. I've never had a problem with headaches when I've been drinking lots of alcohol.
Spiritwolf suggested B12 deficiency as a cause. I suffered from B6 deficiency and there might be other possible missing vitamins. Ask your doctor for blood tests for all vitamins?
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