sella - so sorry you are having a difficult time AND not enough support.
I have been through it too, and sometimes you think everyone in your family is on another planet to you! Agree a bf group would help meet other mothers with similar views to give you moral support and understanding.
your mother probably thinks she is making a helpful suggestion, sometimes it is very difficult to hear someone you love struggling and just saying 'poor you, you are having a rough patch but it will pass' and they instead suggest a practical solution that they don't realise is heartbreaking to you. But it will pass, you can get through it and it will get better!
I had huge rows with my DH, mum and MIL about my stubborness in persisting bf even when exhausted, and my dh now gets it, but MIL and mum i am never going to educate.
perhaps your dh thinks life will be easier if you bottle feed and assumes that means you will get more sleep and dd will be more settled, but that won't necesarily happen. Also ff babies are statistically more likely to be ill, need hospital care or have allergies, which all make life much harder! Your dh needs educating!
You are doing really well, good luck with it all