I fainted twice in a row... help?

So today, I went grocery shopping, and went to put the fruits I got in the fridge and then my vision got dark really quickly and I fell. I think I was unconscious for a couple of seconds. I took a few deep breaths, cleaned up the fruit explosion on the floor and continued to put away my groceries. Then less then ten minutes later, I'm putting away some cashews and olives, and BAM! vision gets dark and I fall.

Now, as a vegetarian I eat super healthy and eat normally and exercise, so... WHAT THE HELL HAPPENED? any ideas?
I fainted twice in a row... help?
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