If you "stuff" yourself, its normal for you to feel a bit sick. If you are eating normally and not overeating, there could be several things wrong with you. If you are a female, maybe a pregnancy test. I would say make an appointment with your doctor!
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If your meal included fats, butter, or margarine, you could have a gallbladder problem (whether pregnant or not). You could have a problem digesting lactose if your meal included dairy products and milk. Or you could simply have a stomach bug.