My Mother-in-law Hates Me....

I honestly feel like I just broke up a family. See my mother-in-law and I have never really gotten along... But I always tried. Me and my husband are 25 and have been married for 4 years. We first started dating at 16. When we were teens she was nice to me. She was blunt but never too rude. That all changed after we got married. She just started... Hating me. I'm a size 14 and she's always made jokes about my weight. His sister had once asked me to be a bridesmaid, and his mom was in charge of getting the bridesmaid dress sizes. She had more or less picked his sister's bridesmaids for her. She had to fight her mom to let me be a bridesmaids. She picked very pretty skinny girls. I told her I was a size 14. When the dresses came in she didn't let us try them on until 3 days before the wedding. When I saw them hanging up and looked through them, nothing was over a size 6! She laughed about it and she she made a mistake, buy since the wedding is in two days it's too late to get another matching dress. His sister apologized and let me be the Host instead. His mom had said "I'm sorry. I'm not used to buying stuff for fat girls!" My husband pulled her to the side and yelled at her. This is just one of many things. Me and my husband have been trying for a baby pretty much since we got married. I have had 7 miscarriages... She has told me "What am I doing wrong?" Or told my husband " She's not a women. She can't even carry a child." Then there's me not having a job. I actually watch children, but she told me being a nanny isn't job and I'm mooching off my husband. My sister-in-law recently had a baby and I was trying to help her. My MIL asked "Do you know what you're even doing". I told her I'm a nanny so yes I do and she said "Is that why you had 7 babies die". I left the room and started crying. I could here my husband yelling at her. He came and got me saying we are leaving. He blocked his mom on everything saying she had gone too far. She called me on another number telling me I'm fat and disgusting for coming between her child if I don't fix this she will make my life hell. My husband said to ignore her. Well things have been getting worse. She started telling family members I lied about being pregnant and then told some I got abortions. These are very religious people by the way. She also found out I had gotten pregnant by someone when I was 15 and told my husband (I miscarried that baby too... So technically... 8 miscarriages). We have pretty much been banned from the entire family except for his sister. He lost his entire family because of me. I feel like an awful wife....