I started my period today. I got lower back cramps like usual. But then, I felt like I was going to throw up. Then, when I was walking to the kitchen to get advil, I felt like I could've fallen over at any time, and nothing was clear. I felt so dizzy. I had to lay down on the bathroom floor, and it still took me awhile to get back to normal. Why did this happen? Could it have been because I haven't eaten all day (I woke up late, so never had the chance).