I’ve done a poor man’s tilt test in my college dorm. It was brutal, I was in pre syncope for around 4 minutes and was hanging on for dear life😂 After laying down and drinking a ton of water I felt totally fine. I view it as a small amount of torture in exchange for an invaluable amount of answers!

I've been there twice. It's going to be every symptom you already felt, just more intense and at once. It is scary mentally prepping and even during the exam. Even though it is hard to do, stay calm and focus on breathing.