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Dizziness, vomiting and unresponsiveness
A sinus arrhythmia would not account for your symptoms, but that doesn't mean you had an arrhythmia during those episodes (thus not recorded). Fainting certainly can be caused by an arrhythmia, either too slow or too fast that may decrease the blood flow to your brain.
I cannot tell from here whether this is a cardiac vs. neurological issue, or whether you have a GI problem with dehydration. Frankly, this is the kind of thing your PCP should sort out, so that he can refer you to a specialist with a specific question. For starters, I'd look into your cardiac risks for a heart attack, while for an arrhythmia I'd consider a Holter monitor, a echocardiogram and/or a stress test. You can check your risks yourself here.
Any recommendations would be a result of answers to these considerations
Hope this helps,
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