Then my vision clouds and the roar returns

Prompt:  My brain is on fire, my spine burns itself through my back, I feel near apoplexy. I am blind, deaf, insensate. I hallucinate. Seen with such preternatural clarity and contrast that they must be illusory, unspeakable horrors loom all around me, scenes not of physical violence but of psychic mutilation. Mental agony and orgasm. Terror and hysterical laughter. For a brief moment, perception returns. I'm on the floor, hands clenched in my hair, some uprooted tufts lying around me. My clothes are soaked in sweat. I've bitten my tongue, and my throat is raw: from screaming, I surmise. Convulsions have left my body badly bruised, and a concussion is likely given the contusions on the back of my head, but I feel nothing. Has it been hours or moments? Then my vision clouds and the roar returns.