Mentally and Physically Tortured

I was married some three years back with a lot of dreams and expectations.It was arranged,after sometime I came to know that my husband is not mentally fit and his mom gave medicines before wedding so that he feels sleepy all the time and dont have any power to argue or say anything,As i was not aware of all this,I never gave any medicine and he behaves so misreable. My mom in law influence my husband to harass me every day for every single thing in the house, thereby making my life miserable. Actually my mom in law has major influence on my husband n he agrees to whatever wrong she says. Whenever he returns from Work she creates one or the other scene and lies to him for petty issues. She tells lies to him and ignites fight/ arguments between both of us and clearly tells my husband, right infront of me to divorce and remarry.He started abusing me and my family and relatives too.I tried my best to continue the Wedlock but he is not worth to live with.I m done with all the cruelty and there need for dowry all the time.Now from last one year i m at my parents place.Plz suggest legal implications in this matter and oblige. I will b very grateful to you. Thanks in advance....awaiting your legal advise....