What Causes Dizziness, Blurred Vision And Sweating?

I just got the strangest dizzy spell. My vision started to go black, my hearing faded, my fingers and toes were tingling, I felt dizzy and nauseous, I started sweating profusely and having hot/cold flashes and breathing heavily. I have never experienced this sensation before. Before it happened, I was sitting comfortably in a soft chair.
>After I laid down for a bit, it passed, but I still feel tingling and nausea.