Thanks to everybody for the emergency hair advice. I ended up going to the 24-hour Duane Reade at 5:00 a.m., getting another bleach kit, and doing it again.
Now my hair is a gorgeous shade of blond never seen before on this planet. It is also so fried from the bleach that if anybody touches it it will crumble to dust.
It’s okay, since it’s falling out anyway.