Final answer:
The subject of the question is Health. Melody's symptoms indicate bipolar disorder, a mood disorder characterized by alternating episodes of mania and depression.
Step-by-step explanation:
The subject of the question is Health.
Melody's symptoms of experiencing severe mood swings, feeling highly energized for a period and then experiencing extreme depression are indicative of bipolar disorder.
Bipolar disorder is a mood disorder characterized by alternating episodes of mania and depression. During manic episodes, individuals may experience elevated mood, increased energy, and impulsivity, while during depressive episodes, they may experience feelings of sadness, hopelessness, and low energy.