Symptoms of chronic fatigue syndrome can vary from person to person, and the severity of symptoms can fluctuate from day to day. In addition to fatigue, symptoms may include: 
Extreme exhaustion after physical or mental exercise.
Problems with memory or thinking skills.
Dizziness that worsens with moving from lying down or sitting to standing.
Muscle or joint pain.
Unrefreshing sleep.
 Some people with chronic fatigue syndrome have headaches, sore throats, and tender lymph nodes in the neck or armpits. People with the condition also may become extra sensitive to light, sound, smells, food and medicines.