Situation of divorce due to mental conditions of husband

I'm 27 yo, married since 2014. I recently got to know that my husband is mentally ill and is suffering from schizophrenia. I was unaware of his conditions before marriage and my in laws tried to hide this information from me until I found medicines that he's taking regularly. My marriage was a complete farce and I never felt like a wife. I faced many situations in day to day basis where he will be delusional and will be angry and frustrated all the time, never knowing the exact reason. He was distant all throughout and everything was being carried out secretly among my husband and family. I was even forced to end my side of relationship with my family and friends and act like a maid for him. They took dowry as well at the time of wedding. I feel like cheated. I am not happy at all. I left him the moment i got to know about the medicine and came back to my parents. My father in law is now harassing me on call. Please guide me on what to do and how to get justice for the 4 years of suffering with a lunatic.