mini blackouts/dizziness, what could be causing it?

United States
September 12, 2008 12:21pm CST
Since mid-July, I've been having mini blackouts and dizziness. Sometimes, them come from standing up too quickly, though, most of the time - it just hits me out of no where. It's mostly dizziness that has been bothering me. At first thought, I figured I was eating enough, but, I think I am. I try to eat at least two (I tend to get up after breakfast because I work 3rd shift often) healthy meals a day, sometimes with fruit in between. I don't know what else could be causing it? If you have any idea or think it is because I'm not eating enough - do share, please!