Nepal is a poor and corrupt country. The whole World knows about it. The Nepal Embassy has already proved it.
You are in big trouble. If your Nepali Passport is expired, US immigration will require you to show a valid passport and if you can't fly to DC because you re out of status here, then you will not get your new Nepali Passport. Nepal Embassy will not help you UNLESS IF you know someone in Nepal Embassy. " Aafno Manchhe"

It s called ' you got punched in your head and butt at the same time'.
You re screwed.