The other day, I was walking to my room to get ready for my concert. I leaned in the doorway of my living room, and my vision got very blurry. Everything went black for a few seconds, and I woke up and I was looking at the ceiling, my dog was sniffing my face, and my head hurt severely. I sit up quickly and say "Did I fall?" My mom said she heard something fall, but that happened about five to ten minutes ago. I've been feeling lightheaded, extremely hot/cold at times when it was room temperature, and very nauseous ever since. Has this ever happened to anybody? If so, please tell me, because I'm starting to get extremely worried. My fall was about three days ago and I'm not sure how long it's going to last until I feel normal again.