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There are two issues in this situation - the abdominal symptoms and the blacking out, although most people are going to be most worried about the blacking out
The blacking out that you describe sounds like a vasovagal episode. The term refers to a sudden activations of a portion of the involuntary nervous system that causes the blood vessels to dilate and blood pressure
to drop, which can lead to fainting or lightheadedness. This can happen in response to a variety of stimuli, including stomach cramping, nausea, vomiting, or diarrhea. Although it is impossible to make a definitive diagnosis based solely on the history, it sounds like a vasovagal episode and is the most likely. Although some people have recurrent vasovagal episodes, they typically happen only in response to certain stimuli, so generally does not require specific treatment.
The abdominal symptoms are less worrisome, and could either simply be due to a virus or a reaction to the foods that were eaten. If the abdominal symptoms resolve spontaneously, there is no reason for further evaluation or concern. If the symptoms persist, it would be appropriate to look for other problems, the most often being various infections of the gut.
If you have any further questions, please let me know.