Assuming I survived the blast, am not totally deaf from the blast, blinded by the smoke/dust, on fire, or being crushed by debris... all of which are possible and likely -

I would like to have a comprehensive FAK to treat myself first, then others. Just plain old pressure bandages would be great as an emergency first response. I'd like some filter masks. I would like a flashlight or two, and some glow sticks. A small pry bar would be helpful. Maybe a whistle. All this and more would fit in a small toolkit bag and could be stashed in the bottom drawer of a desk.