Black out and dizziness spells

I have been having little "black out" spells for about 2 years now. I will get extremely dizzy and loose my vision along with a severe headache. These spells do not usually last very long, but this past wednesday I got extremely dizzy, more than normal, so dizzy that i could not even walk. I started having a panic attack and completly freaked out. My mother rushed me to the hospital, they gave me a blood test and a EKG. The EKG came back normal and I should get the blood test back soon. I am worried about what may come from these symptoms when no one I have gone to has known what is wrong with me. I know that there is really nothing that you can do being over the internet. But if you could email me back with a suggestion or something of what could possibly be wrong or if you know a test I need to do that could show some results. I have also had a Cat Scan of my head so we know that I do not have a brain tumor.
Thanks for your time,
Lynsey

You should have all possible doctors' examinations. If they cannnot find anything wrong, your symptoms might be due to anxiety.

Read about anxiety. But you may have anxiety problems even if they do not exactly fit this description.