My wife is destroying my life

Hi my name is sachin and i am 27 year old male. I married to a girl in india 3 and half year ago. she came here last year November, 2009 with my son. My son is now 18 months old. After coming here in november 2009, she stayed with me for only 1 week and seemed totally different person. she abused me and cursed me and acted totally crazy. She even got arrested for an assualt charge on me and stayed in jail for 2 days. anyway once she got out she took my son with her and went to india and left the child there and came back to USA. The time she came back she started following me asking for her green card and ssn#. I didn't want to deal with her so i gave her the ssn card and her 2 year conditional green card. She still didn't leave me alone. She want back to india and came back with the child this time and started staying in the same city i live in. I went to see my son few times at her place. now the situtation is that she wan't let me see my child. she also threating me if i divorce her she will take half of what i have. I paid my house after marriage around $60,000 she was still in India at that time, but we were married. I want the custody of my child. I have talked to a family lawyer and gave him $3500 to start the case. I belive my wife is mentally not stable. She have tried to cut her wrist in the past with the blade and signs of cut are still there on her wrist. Also, I want to talk to a immigration lawyer for anything that i can do to stop her getting extend