Divorce

I am 28 female doctor and with lots of income have 1 1/2 year girl bay my husband does not earn much but good man we lived with his mother and elder brother and his family .mil is very controlling type fighting for everythin telling me not to have children even tried to poisn me but i dont have proof she did it to stop me from getting child since her elder son dose not have child i told my husband and finally she attempted suside was in hospital for 4 days we left the house and settled in diff house where i spent 90 percent expenses. she slowly blackmailed him to return to her and one day when my parents visted me he called his family fouht with them and threw me and my child out . now he wants me to come back and live with his abusive mother i am afraid she may poisn the the little one i want to live seprately with him but he is not agreeing not talking properly he asking for proof ,i dont feel like getting totured again . should i go back or divorce him which he may contest i dont want any alimony.