Since your tests are normal, your symptoms of
hyperventilation, palpitations and dizziness could be attributed to Chronic
Hyperventilation Syndrome. It is characterized by hyperventilation for no apparent reason, frequent yawning, palpitations, dizziness, sweating, fainting, depression, and cold sweats. Please discuss this with your doctor am sure he will provide further assistance. In the meantime you could practice breathing exercises and good relaxation techniques like yoga and meditation.