Notice from husband ...what to do next??

Hi Sir/ madam, I got married in march-2014 and ever since my mother--in-law and brother-in-low and my husband were torturing me with domestic violence and physical torture, they would not feed me and I was forced to go for work for money, they also tortured me to bring dowry from my parents. I Became pregnant and even then they wont feed me properly and I had to go for work after 8 months of pregnancy I left job and I was sent to my parents place for delivery. I gave birth to girl child( in a ESI hospital as my husband refused to pay me for my medical expenses), my in-law's and my husband was not happy about the girl child as they wanted male child. My husband completely stopped coming to see me and my child for about 5 months and now im not interested to go back to that hell where me and my daughter are not treated like humans. Now my husband wants me to go back their house , for which I refused and then he has sent a lawyer notice stating that I have to go back. I don't want to go back ,and want to know how I can file a divorce. Since he has already sent a notice me making false allegations , is gone effect my proceeding if I go for divorce. Please help me....