question: I am a 16 year old female, I am 7 and a half stone and while disabled suffer no other illnesses. I have had spells where my vision blurs, my hearing changes so that the pitch of the people talking around me is painful, I sweat excessively and my heart races. These spells happen for 15-20 minutes at a time and I have suffered from them since I was a child however it is only recently when they happened during the day (while I was in lessons). Any suggestions toward the cause?