I was practicing holding my breath, trying to beat my record of 1:56. I tried over and over again. I only went 1:30. My head hurts, I've waves of extreme malaise and nausea, and my head burns on the inside if that makes sense. I have random dizzy spells and now I'm pretty nervous. I did it 2-3 hours ago. Is this an emergency? I hate it, I keep thinking about aneurysms and crap. I'm never holding my breath again.