What happens when your autonomic nervous system isn't functioning properly? what are the symptoms?

Read : Autonomic failure is a disorder of noradrenergic neurotransmission in which postganglionic sympathetic neurons do not release norepinephrine appropriately. Subnormal norepinephrine release results in impaired vasoconstriction and reduced intrathoracic vascular volume, both of which contribute to orthostatic hypotension. The absence of an appropriate reflex-induced increase in heart rate as the blo.