That's why you write to a computer program that saves the chapter for you. Most word processing programs have an automatic save feature, so that if the computer crashes, it easily picks up from the last save.
Worst case scenario is that you'll have to write it all over again, unfortunately.
Except you were rude. All that your reviewers told you was to do two basic things about writing: make it readable, and do your research. You blew off your reviewers by claiming that you don't care. And that is rude, since your reviewers took the time to read your story and leave comments. Also, it's rude because you made several claims about a culture that are racist ("all Japanese parents are abusive!" "Japanese children are mean!"), and don't care that you're harming an entire country.
I closed your thread, and am keeping it closed, because there's no point in keeping it open. If you don't wish to respect reviewers even when they respect you, I don't wish to have that attitude in my section. You're going to get people who don't like parts of your story. When they tell you that and how to fix it, offering you help, it's rude to say that you don't care and that everyone is being mean to you when everyone is being perfectly civil to you.