Take a deep breath....
I would say the worst is over really. On the wedding day, they can't be that demanding of you anymore as everything will be decided. Just make sure on the day, that you get ready first in a nice area/room on your own and leave the three of them to their own devices with the assistant hairdresser/ make up girl etc. Shelter yourself from the stress and enjoy your day.
Thats awful. I'm sorry not much I can say to help, but just a bit of sympathy.
You were left alone at your hen?