I am sorry, SD. I think I might have had one recently, but I don't know. I am always super anxious but when I had it I wasn't feeling any different then usual (and I don't usually get them). My heart was racing and things in the room looked very bright to me. I looked up ways to slow one's heart rate online and it said to press on your eyes and also hold your nose and blow through it...those helped me feel better (in case any of that is relevant to you, SD).