Answer:
According to Enid's description of her condition, she has most likely been diagnosed with bipolar disorder.
Explanation:
Bipolar disorder is a condition that affects the normal activity of people who suffer from it, by presenting changes in the willingness to perform their normal life, mood, concentration and energy. These changes occur alternating between well-being and discomfort.
Bipolar disorder is considered a mental disorder, previously known as manic depression.
The changes that occur in Enid, with alternating cycles of weeks of feeling energetic, talkative, and sleeping less than six hours a day, and weeks of feeling hopeless, irritable, and sleeping at least ten hours a day, are compatible with bipolar disorder.
The other options are not correct because:
