Hi, for the past few years I've had these episodes

Patient : Hi, for the past few years I've had these episodes where I start to not feel well, maybe a headache. Then I get really hot and my head starts to pound. My vision starts to go black around the edges and I feel that if I don't sit down immediately I will fall. Sitting does not make it feel better. I also get very nauseous. Lately they've been coming more often and actually making me puke. Why?? I'm not particularly dehydrated or hungry when it happens.
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