What the Hell Happened to me on Sunday?

So on Sunday, I had a sudden headache, and my vision got sort of messed up. The only way I can describe the vision problem was it was the same blur you get when you look at a bright light, only I hadn't. I have had that happen before, in fact, I used to get it a lot when I was a kid.

The headache didn't last long, but I got very dizzy/lightheaded, and had to lie down. I had another feeling, like a mixture of hunger and being extremely nervous at the same time. I did start sweating also, although I felt a little cold.

What the fuck was that?