I'm in the lactose intolerant camp too and way overdid it on the dairy this holiday (chocolate and cream mostly!) I've been very sick for the last day and a half with nausea, cramps, the works.
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Thankfully I'm feeling better today, but man did I learn my lesson!
(I drink either soy or rice milk normally. I like the rice milk better actually, especially if it's vanilla flavored- yum!)