Want to file a complaint against my husband who is in deputed to USA on H1B visa

My Husband is on H1B visa and deputed to USA. He left me and our special need child in India and not coming back. He has no reasonable reason for separation. When his family came to know baby is special child they started giving all blame to me and sent me back to my parents place. His family started ignoring my texts and calls from last 1 year. Husband too not talking to me from last 6 months. They also not allowing me to stay in their house and husband stop sending monthly expenses too. I came to know from there friends in USA that he is upto Green card and planning not to come back here. I had already sent a legal notice to him and his family and his company that take me and child back with you to USA and start sending expenses, as child is 90% handicapped and I'm not working. Instead they now putting allegations on me that I'm working and I had fight with my husband 4years back which is baseless. I had a very good realtionship with my inlaws and husband before child birth. Mostly all this ignorance started after medical report states that baby development is not possible. Please guide what should I do further to save my marriage. Thanks in advance!!