Green vision, hot and clammy, feeling like going to vomit?

Hi, I am a 15 year old girl. And I have had a few incidents where suddenly I feel like I am going to vomit , it feels really hot, and my vision goes green or black for 5-10 minutes. I also get a bad headache. One time it happened doing yardwork in the heat, and one time I was just standing there and it happened out... show more Hi, I am a 15 year old girl. And I have had a few incidents where suddenly I feel like I am going to vomit , it feels really hot, and my vision goes green or black for 5-10 minutes. I also get a bad headache. One time it happened doing yardwork in the heat, and one time I was just standing there and it happened out of the blue. What could it be?
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