A Distributed Denial of Service attack is an attack by a group of zombies (bots) that seek to do an attack on a large group of people, this is why it has the name distributed, these are targeted on things like schools or businesses.
A Denial of Service attack, no matter the length or strength of it, could not possibly delete your account, that is down to you, or down to some other thing. It's impossible for a DDos or Dos attack to harm your account and completely delete it.
I'm probably being baited but I might as well bite.