My Son Now 23 A Professional Ballet Dancer Has Had

My son now 23 a professional ballet dancer has had a double ablation when he was 18. At least once before and last night, he apparently stood up from his bed, felt dizzy then had uncontrollable shaking where he couldn't speak. This went for what he said was a couple minutes. Then he was fine. I made an appointment for him to see the cardiologist but he refuses to go says he is fine and was very agitated about it. He has had his blood pressure checked and says it is perfect every time. He lives two states away and is just visiting.mcan this just be stress, or should he be more concerned?