Severe fatigue that lasts longer than 2 weeks, causes you to limit your usual activities, and does not improve with rest.
Sleep problems that last for more than 1 to 2 months. These problems may include being unable to fall asleep or stay asleep, tossing and turning, and waking up feeling tired or not rested.
Swelling in the glands in your neck or armpits (without other signs of infection) that lasts for at least 2 weeks.
Severe fatigue along with frequent urination (especially at night), extreme thirst, weight loss, or blurred vision. Fatigue that occurs with some or all of these may be a symptom of undiagnosed diabetes.
Headache that lasts longer than 2 weeks.