I think it EXTREMELY unlikely that your husband will get custody of your child....given the circumstances that you have described.
In the vast majority of cases the mother is given custody in this country, regardless of the mother's immigration status.
There is nothing to stop you taking out a court order against your husband, regardless of what the police decide to do.
That again is something the people supporting you will be able to advise on (free advice charities, social services etc).
This isn't the Philippines where you have to pay enormous amounts of money to lawyers and then sit around waiting for decisions for years.
We have a proper legal system that is free to all who cannot afford to pay, plus free legal (and other) advice at your local Citizens Advice Bureau.
