Brief answer- floss and brush, and see your dentist. I don't mean to scare you, but gum disease can cause you to lose your teeth. You could also have badly infected gums.

It can be "fixed" if you start to take care of them. It would be a terrible thing to lose your teeth. It is part of your self caring and recovery to take responsibility.

If you want the bleeding to stop, then you need to push yourself to doing something about it. Sorry if this seems harsh, but your teeth aren't going to take care of themselves.