Significant hearing/sight disturbances & electric shock type pain in head during eeg hyperventilation. normal or seizure? or something else??

See your doctor: Anytime I hear someone say they have significant changes in vision or hearing -- I always advise them to follow up with their physician as soon as possible for evaluation. As these symptoms can be implicated in such a wide variety of conditions - it's the only prudent course of action. Make an appointment ASAP. If symptoms worsen, head to the ER. Hope you feel better & good luck!