From the 10 yr old book:
Chronic Fatigue Syndrome: a Treatment Guide by Erica Verrillo and Lauren M. Gellman
Dr. Luis Leon-Sotomayor, the cardiologist who documented the 1965 CFIDS epidemic in Galveston, Texas, described a type of neurological dysfunction that he called a "sensory storm." These storms affect the autonomic nervous system (regulated by the hypothalamus). A person experiencing a storm may first see an aura or sense that something very bad is about to happen. Storms produce sweating, pallor or flushing, elevated blood pressure, slowed respiratory rate, tachycardia, dizziness, and the feeling that one is about to lose consciousness. These autonomic storms are terrifying, but the effects generally pass within an hour. After such an experience a person may feel lingering tiredness or malaise...
People who have warnings of impending seizures or seizure-like episodes, either in the form of a rapidly escalating sense of urgency, surges of strange sensations, intense fear or rage, "spaciness", or any kind of sudden perceptual disturbances can sometimes prevent their full manifestations by immediately withdrawing from all sources of stimulation and entering into a relaxed state through meditation, relaxation exercises, or self hypnosis techniques. This has the effect of changing the brain wave frequency to alpha waves.