It took a great deal of courage to tell us your story. It is not easy, even anonymously, to share the details of so much pain and betrayal and also to honestly admit still not knowing what is real and what is not. We here understand.
You need support. Very much. We can give you support and you also need face to face support.
You say you have insurance. I believe your insurance will very likely cover counseling. You really must get some help.
You can make an appointment with your family doctor and there reveal the physical assault, get a thorough check, and ask the doctor for a referral to a counselor. Insurance should cover counseling for several weeks or perhaps several months. You cannot face what is to come alone. You must have support, right there where you live.
Others here will address the legal issues, as many here have experience as spouses of addicts who are dangerous. And your child is at great risk of harm. Others here will share their advice about that issue as well.
Please do not be alone with this devastating crisis in your life. Tell your friends. Tell them everything. Tell your family. Spouses of addicts keep the secret, they protect the addict/abuser, they think they can handle it and that everything will eventually work itself out and no one will ever have to know what happened and won't judge the addict. That is always a mistake. It isolates the spouse and gives the addict even more power over her as a result. Coke addicts thrive on power.
Though you are still in terrible shock, you must start now suiting up for the biggest challenge of your life: saving yourself and your baby from a life of pain and chaos. You are going to have to face the facts of addiction and build a wall of protection against it. You and your child are in real danger.
We also recommend Al-Anon meetings for support and education. Reach out and get your support system in place, for alone, we are lost. Addiction and the addict are too powerful.