What action can be taken for mental torture by the in laws and husband?

Hi, I am from Kolkata and had been married sin Feb 2016. Since my marriage I give money to my in laws for the household expenses. My husband wasn't contributing any money and as I get more salary than my husband so had to cover up for both.After 6 months my brother-in-law's wife stole my gold necklace that was gifted by my Mother-in-law during the wedding. Since then for some or the other reason my in-laws started insulting me and started mentally torturing on petty issues. Also they have started asking for more money. My husband doesn't react though he admits his mom and his brother are wrong. Actually my mom in law has major influence on my husband and he agrees to whatever wrong she says. Now they have started giving me such mental torture that I had to leave my husband's home and moved to my parent's place. My husbands says if i have to be in the relation then i have to listen to his mom and brother. With these ongoing fights my husband has also beat me. He can't leave them. So he is asking for divorce. I m really very helpless and don't know what needs to be done. Please suggest what should I be doing if they file a case for divorce. I do not want to initiate the same however they are keen on it. I am really under severe mental tension. Plz suggest legal implications in this matter and oblige. And what are the steps I can to safeguard myself? Thanks in advance and looking forward to some helpful replies.