I just ran across this item today (below), and thought it described very well some of the "spells" I've experienced over the years. I think it's been a few months since I've had one of these, but I live my life with a general awareness that one of these can come up at any time. Though it's usually some type of over-stimulation that triggers this for me, it can also come about for no apparent reason. Anyway, I thought I would pass it along. For me, experiencing one of these is always a reminder of how tenuous my hold is to this physical world. These "sensory storms" leave me with a feeling that at any time, something fairly minor could come along and "tip me over" (can't really give say what a good definition of that feeling would be). This realization doesn't necessarily bother me, and can actually be a reminder to appreciate life as it is right now. -- Wayne Sensory Storms I've been reading a book written 10 years ago called Chronic Fatigue Syndrome: a Treatment Guide by Erica Verrillo and Lauren M. Gellman. I'm finding it helpful in understanding some of my symptoms. I found a description which pretty much matches these weird terrifying experiences. It is some sort of seizure like activity. Seizures are often preceded by a feeling that something bad is about to happen. Anyway, here is the description from the book (p. 116): "Sensory Storms" 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.