Yesterday I went to the gym. After 5 minutes of a circuit exercise, I felt dizzy and sat down, and the next thing I knew, I lost consciousness and had tremors on both of my legs. I recovered consciousness after 5 seconds but felt nausea and vomited right after that. None of my family members had a history of epilepsy or similar. I used to faint before, 4 years ago, but I didn’t have any tremors back then, and it was during exercise as well. Please help.