What Causes Dizziness Along With Breathing Difficulty?

I experienced a very strange episode recently, I started feeling dizzy and broke into a sweat, I had difficulty in breathing and I had to lie down on the floor, then I noticed my hands were vibrating and the vibration got so very intense, and I realized I couldn t move my hands, they were totally rigid as if in a spasm, this lasted for about 15/20 minutes in which I tried hard not to panic and concentrate on breathing slow and deep which wasn t easy. The most alarming thing for me was the intense vibration and spasm of my hands.