Hello,
You can file a case of divorce on he ground of cruelity and not on the ground that you can not live with her.
If she threatens you then file a complaint at the police station with regards to the same.
Welfare of the child is of paramount importance and this will be of prime consideration of the court while deciding the custody.
However, till the age of 6 it will not be possible for you to get the custody.
Regards