What's wrong with me? Very weird story?

On Wednesday(1/26/11), I got my braces off, then went back to school. In 3rd block, I was just fine. Then a few minutes after 4th block started, I noticed that my hands started to get really cold. On the bus ride home, I was shivering a lot. Then when I got home, I laid down and wrapped up under a blanket. While I was under the blanket, I was still cold, and shivering. (I had on my jacket, long pants, and long socks). Shortly after, the fever came in. My legs were numb, and I couldn't see straight, and I was very light headed. After I got out of the shower, my heart was beating rapidly and I was out of breath. When I laid back down, It felt as if my brain was pounding against the front of my skull. I recovered later on that night. The next day, the same thing happened, but later on in 4th block instead of the first few minutes. Does anyone know what's wrong with me?