Out of the blue I have this quick overwhelming sensation that I am going to faint. My body jolts and I sit up gasping for air. My body becomes very hot and I experience intense nausea. Once the panic attack peaks, I begin to shake all over my body. I sweat but am cold at the same time. My heart beats so rapidly I can hear it in my head. It last for about 30 to 40 minutes. Then it passes and I feel drained.