Harassment from Mother in law

Mine is inter caste love marriage. Mother in law is not liking the facts since the first day. She has been openly telling me that she will create trouble in the relations, which she has been doing. Firstly i ignored, and continued. Now she is feeding all the in-correct and wrong things to my husband and creating a fight between us. Sometime my husband accept that his mother is wrong, some time he behaves otherwise. Mother in law always ask gifts in terms of cloth jewelry and money from me as I am working and when i said no, she considered it as a insult, and also insisted to give cash to her daughter, who is already divorced and staying with her parents. Now with all the financial stuff she expects me to give, which i am not. now telling lies and creating fight between me and my husband, she is instigating my husband for a divorce . And out of anger my husband also asked me to leave house and he has started filling divorce. In altogether, i was abused by mother in law and sister in law, and being harassed for money and not being from same caste, their behaviour is very bad towards me and now husband is thinking for filing divorce. I am 8 yrs married and now and having 6 yrs old son. what should i do?