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Dreaded_Anomaly comments on Fix My Head - Less Wrong
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You are thinking of lactose intolerance, which is a digestive problem (enzyme deficiency), not an allergy (immune reaction, typically to a protein). Actual milk allergies do exist, but they are much rarer among adults. Headaches are not known to be a symptom of lactose intolerance.
I am specifically talking about allergy, which is indeed completely unrelated to lactose intolerance, and are said to be very common, but that generally symptoms of the allergy are so weak that you can ignore them.
"A group of phosphoproteins in milk are commonly referred to as “casein”. Casein, which comprises 78.7% of all the protein in milk, is a major trigger of migraines and other types of headaches." http://www.metabolism.com/2008/08/23/stress-foods-food-additives-hormones-initiate-headaches
I have seen numbers showing ~75% of adults have some degree of lactose intolerance. I have not seen such numbers for milk allergies.
75% of adults worldwide are lactose intolerant, but it's strongly bound to ethnicity and North European backgrounds are outliers on the low side. Lactose intolerance rates for adult Americans of European ancestry are between 8% and 15% depending on what numbers you trust (self-reporting appears to give lower prevalence than other approaches), with the rates for Americans generally being about twice that.
I don't know anything about the allergy, but I am lactose intolerant and my symptoms do not include headaches. Nor have I ever heard of that showing up for others with the problem.