Oh darl. Just lay low and let her calm down. Maybe put your headphones on and listen to some music to drown out her banging. I'm sure she'll have calmed down by morning. I once had a flatmate's boyfriend threaten to kill me, my boyfriend and my boyfriend's dog whilst waving a hammer around and I lived to tell the tale, so I'm sure sure it will be ok xxx
She just called the house actually! For my sister who's a) at work and b) doesn't live here any more.
She's still very into her "relaxing" though. Apparently it was "nice to see my folks and sister on skype today now relaxing", and yesterday she was "in bed resting up". Another new trick of her's is to always bang on about the weather...
Say you saw a flat tomorrow and like it. You could probably give the deposit the next day, and agree for the move in date to be a week's time, the 11th.
If that happens, you'll be paying rents for the three weeks overlap. I don't know if you can afford that. I'm a worrier so I was happy to absorb that cost for peace of mind when I was in a similar situation.
If it takes you longer than a day to find a place (which it will) and/or if you can get the new landlord to give you a longer period of time than a week, then the overlap will be shorter.