My son went through this from 2-5. Last time he was taking a bath. Luckily his cousin was bathing with him. They were playing then my nephew says auntie tell Michael to stop blowing bubbles in the tub. I ran in and he was seizing. I didn't have a car and couldn't afford ambulance. Luckily my neighbor was a nurse and took us to hospital.
I’ve seen this 3 times in my field of work. One was on my first day at a new childcare center. It helps to keep calm so the child/children can be calm as well.