9 and half week old DD has decided she only wan...

9 and half week old DD has decided she only wants the boob. She was good with bottles initially so I could express when we go out but now sbe screams and turns her head and slams it against my chest. DH hasn't had much luck either. She'll take about 30-50ml with him before screaming. How do I get her to take the bottle? Using avent at the moment, did anyone have luck with tommee teepee closer to nature bottles? I'm thinking of trying those. I think by 4 months I will move to formula as DD still eats 9 times a day (every 2 hours in the day) so I can't even go to my pilates class. I am tied to her 24hours and its driving me insane. Does breastfeeding ever get better cos I hate it but am sticking it put for her benefit.