Ice dream or anything cold gives you a brain freeze when it touches the roof of your mouth where there is a blood vessel that connects to your brain. This is why your brain "freezes". You can put your thumb on the roof of your mouth and the brain freeze normally would go away.
No it is not humanly possible for a person to die from a brain freeze.If you could die from a brain freeze the population of people would decrease every second of the day.Someone in the world is having a brain freeze right now but i dont actually think they are dying.
"Brain freeze" is not really inside the brain. It is a headache that you get from eating or drinking very cold substances. It is actually caused by rapid cooling and rewarming of capillaries in the sinus cavities.