Awww i really have no advice - we have just recently been there and done that with Miss B but she didnt throw the tantrums, just kepts waking up or walking out of her room, it must be very exhausting on you! we just kept walking her back to bed, and we took turns DH and I so that helped heaps!
The only thing i can prob suggest is maybe try not closing her door all the way, i know Miss B hates her door being closed at night, we just pull it too, maybe she likes that cause she can hear us and have a bit of light in her room????
Also i found during the night if Miss B woke we gave her a drink of water, she would have a big drink than lay back down and go to sleep?!
No doubt i havent been much help, i hope things get better for u soon - u need ur rest!!
Take care xx