dude, dont tell me youve never gotten a headrush b4, its caused by the lack of blood to your brain, then sudden rush, the faster you stand up after a long period of sitting/standing, the greater the headrush will be, it happens to me all the time, since as long as i can remember, even b4 i started smoking

if you want to cure them, simply, GET UP SLOWER, thats all there is to it