A person with hypoglycemia may feel weak, drowsy, confused, hungry, and dizzy. They may have pale complexions and may suffer from headaches, sweating, rapid heartbeat, and feel cold and clammy. They might suffer from heart palpitations, tremors and shaking, and may be very irritable. There could be vision problems, anxiety and nervousness, palsy, and lack of muscle coordination. In severe cases, there may be personality disturbances, loss of consciousness, convulsions, and coma. Many times, these people feel that their energy is chronically low and that they need to eat sugar throughout the day as the only way to relieve their symptoms Severe hypoglycemia can be close to insulin shock and is considered a medical emergency.