Can you describe your first heroin high?

I'm sure this will be a tough one for some people, but I'm just wondering what it's like. I've been extremely stressed this year and have been unable to sleep. I'm just wondering what that first high is like. If you felt like you were dead, in a good way. If it just made you feel calm. If it made you feel like you could do anything. If it made you feel like you were invincible. If it made you feel like you were invincible and could do anything, and if it felt like you were dead, in a good way.