Bad reflux.: Having strong coffee too close to going to bed, especially caffeinated coffee, can cause reflux, causing really bad heartburn and nausea and vomiting. The extra acidity produced in the stomach can lead to that diarrhea you described. However, depending on what you ate for dinner, this could be food poisoning as well. See how it plays out - if it lasts longer than one day, could be food borne.
Answered 1/3/2016
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