I fear going to the dentist because when the dentist uses the drill or any other instrument in which air is blown into my nose, I start to hyperventilate, and feel that I am not getting enough air. I feel as though I am suffocating. As long as the dentist does not use any instrument that blows air, I am fine. I have asked friends and family if this has ever happened to them, and they respond no. I have not heard of anyone experiencing this before. What could be causing this?