Dizziness, Hot Flashes, Headaches, Trembling Sensation, Lost Consciousness, Not A Seizure. What Is It?

Hi, I am a 19 year old female. Yesterday, I was shopping and around 3:00 pm suddenly got very, very hot and dizzy and fell unconscious. If my Mother hadn't been with me, I would have slammed my head through a glass table. I was unconscious for about 45 seconds. Since then, I have felt dizzy, had a headache, felt very hot, and my hands have been trembling. It's really worrying me. I have a history of epilepsy, but I am fairly certain it wasn't a seizure, I am very familiar with the aura I get before a seizure, and this was completely different. (Ps- there's no chance of pregnancy.)