Hello Caroline.. Welcome to the toughest period of your career.. All you can do is keep doing what you're doing now.. Bang on every door, talk to as many people as you can, don't become disillusioned..sooner or later one of the doors will open..
You've just got to want it badly enough..
Sorry I can't be more helpful.. just know that you're not alone out there.. most of us went through it.
Keep banging on doors...