I'm 21 years old and before 2015 had never fainted

Patient : I'm 21 years old and before 2015 had never fainted. Now I have fainted in January, April, and in May. In April and May I went to the ER and they found nothing wrong with me either times (besides a minor concussion in April and needing stitches in May on my chin). I got a cat scan done in May and they didn't find anything there either. What could be wrong with me? I'm really concerned about this starting to happen out of no where.
Symptoms:  Light headed,
Vomiting when passing out
Loss of vision after passing out
Confusion after passing out
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