Heart defects

I'm 21weeks pregnant and my baby girl has severe heart defects, we have been told nothing can be done and was offered a termination. We refused this and emailed every specialist in England. They say that her issues are operable, however, she has no pulmanary artery and without this there is nothing that can be done. I want to know if anyone else had this or help or information as I need hope as I can't describe how much I'm in pain about this. She's my first baby after trying for 4years and ivf. Her name is imogen rose. Any help will be much appreciated.