This particular symptom sounds like epilepsy. While during a seizure, most epileptics lack responsiveness and are variably comatose/incoherent, the brain is actually overloaded with a high level of firing between synapses, creating a sort of mental wave that the epileptic cannot handle. However I would suggest conducting more research on this matter. There are a whole range of mental conditions or diseases that result in rapid, high concentration brain activity.
Bipolar disorder
Bipolar I disorder is characterized by manic episodes, the "high" of the manic-depressive cycle.
a neurological disorder marked by sudden recurrent episodes of sensory disturbance, loss of consciousness, or convulsions, associated with abnormal electrical activity in the brain.
Asthma
Necrophilia.means sexual intercourse with a dead person! The word you want is Narcolepsy: a condition characterized by an extreme tendency to fall asleep.
Schizoaffective disorder is a psychiatric diagnosis that describes a mental disorder characterized by recurring episodes of elevated or depressed mood, or simultaneously elevated and depressed mood that alternate or occur together with distortions in perception.
This eating disorder is called anorexia.
Epilepsy is a disorder affecting the central nervous system. It is characterized by recurrent seizures.
Cyclothymia is a disorder characterized by a history of hypomanic episodes (a mild to moderate level of mania) with periods of depression that do not meet the criteria for major depressive episodes. People with cyclothymia have a low-grade cycling of mood which is not as extreme as those with bipolar I or II.
occurs as a symptom of bipolar disorder (a mood disorder characterized by both manic and depressive episodes). Individuals experiencing a manic episode often have feelings of self-importance, elation, talkativeness, sociability
Manic Depression is now referred to as bipolar disorder and is characterised by mood episodes. So they last at least 4 days. They also must have 'hi' manic episodes/hypomanic episodes (Type 2 bipolar) and 'low' depressions. These moods can last anywhere from days, to weeks, to months. And there is periods of normal functioning inbetween Borderline Personality Disorder has mood swing too, but they tend to last hours. More what you would typically describe as a mood swing.
Generalized anxiety is an excessive anxiety that occurs more days than not in a person's life. It is unrelenting. Panic disorder is characterized by brief periods of intense discomfort. They are non stimulus bound and a person can be free of the panic episodes for long periods of time.