Attention Deficit Hyperactivity Disorder (ADHD): This condition is characterized by symptoms of inattention, hyperactivity, and impulsivity. The hyperactivity component can manifest as extremely high energy levels, and impulsivity can sometimes be associated with increased sexual behavior. Given that the symptoms have been present for the patient's whole life, ADHD is a plausible explanation.

Bipolar Disorder: Specifically, the manic or hypomanic phases of bipolar disorder can present with increased energy and sexual drive. If the patient experiences mood swings or periods of depression, this diagnosis should be considered.
Substance-Induced Disorder: Certain substances, such as cocaine, amphetamines, or other stimulants, can cause increased energy and libido. Long-term use of these substances could lead to a pattern of behavior that resembles the symptoms described.
Personality Disorders: Certain personality disorders, like borderline or narcissistic personality disorder, can sometimes present with impulsive behaviors, including hypersexuality. However, these conditions are more complex and involve a broader range of symptoms.

Pituitary Tumors (e.g., Prolactinoma): Although rare, tumors affecting the pituitary gland can lead to hormonal imbalances. Some of these imbalances can cause increased libido or changes in sexual behavior. Missing this diagnosis could lead to serious health consequences, including vision loss or hormonal crises.
Thyroid Disorders: Hyperthyroidism can cause increased energy levels, and in some cases, may lead to increased sexual drive. This condition requires medical attention to prevent long-term complications.
Neurosyphilis: In its tertiary stage, syphilis can cause a wide range of neurological symptoms, including personality changes and hypersexuality. Given the potential for serious neurological damage, this diagnosis should not be overlooked.

Kluver-Bucy Syndrome: A rare condition usually resulting from bilateral damage to the amygdalae, characterized by hypersexuality, hyperorality, and other behavioral changes. This would be an unusual diagnosis but should be considered in the context of known brain injury or disease.
Hypomania due to another medical condition: Certain medical conditions can induce hypomanic episodes, which might include increased energy and sexual drive. Examples include disorders affecting the brain, endocrine system, or other organ systems.