What is dysautonomia?

dysfunction of autonomic nervous system.

U can find more information here

Dysautonomia is the disruption of the function of the autonomic nervous system (ANS). The ANS is tightly tied to the body's endocrine system and also directly controls some aspects of blood pressure control and metabolism.
www.nursingstudy.com/encyclopedia/Chro...

Dysautonomia is any disease or malfunction of the autonomic nervous system. This includes postural orthostatic tachycardia syndrome (POTS), neurocardiogenic syncope, mitral valve prolapse dysautonomia, pure autonomic failure, multiple system atrophy (Shy-Drager syndrome), and a number of lesser-known disorders.
en.wikipedia.org/wiki/Dysautonomia
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There is no cure for dysautonomia. Secondary forms may improve with treatment of the underlying disease. In many cases treatment of primary dysautonomia is symptomatic and supportive. Measures to combat orthostatic hypotension include elevation of the head of the bed, frequent small meals, a high-salt diet, and drugs such as fludrocortisone, midodrine, and ephedrine.
http://en.wikipedia.org/wiki/Dysautonomi...

Dysautonomia is simply a malfunction of the autonomic nervous system. In some cases, the disease can cause reduction in the heart and circulatory systems abilities, causing dizziness or fainting when sudden movements occur. Sometimes it can cause your heart to beat much faster for no apparent reason. Sometimes the disease will only hinder you slightly, and other people can become totally disabled and unable to get out of bed at all.

It is a nervous system disorder. You can read more about it here
http://healthlink.mcw.edu/article/921725...