Mental harrassment by wife and inlaws- suicide attemp

I had been married before 10 years. Now I have 3 children (8yrs+6yrs+4yrs). My wife is sharp-tounged lady since marriage. She always speaks very loud. After 01 year of marriage, she started unnecessary arguments with me and with my family members. Most of time, she left me and threatened me to go to his home. 5 to 6 times she did the same with me. I am very disturbed with her. She always chides to my children. One day she broke one green chilli and put in the mouth of my 02 years old son and I was not present at home at that time. Only mother and my two daughters were present. Her behave is very frustrated with all the members. on February 12.2018, she argued with me, I beat her and she drank Karosene oil, I tried to open her mouth but she did not openend and then I again beat on her mouth so that the mouth could be opened and karosen could come outside. I immediately took her the doctor, when she receoved after 1 hour, she loudly informed the doctor and her inlaws that I beat her very much then she drank karosene oil, On hearing this, her brother abused me and tried to beat me. But she is my wife, I brought her to my home. But now she threatens me of her brother and threatens to also take suicide attempt once again. Moreover, she also threatnes me that she will go back with my children. No children will live with me. SIR/MADAM, i am very upset what should I do. PLEASE HELP ME.