Dear Sister, you are not alone, I have been in a situation similar though I had no kids. You need to protect yourself and your child. Please avail yourself of county services to do that - they can also find you counseling help. Please seek the fellowship of believers at a local church and ask for prayer so you do not feel alone. Talk it out with a counselor at the church if possible... you need to talk to someone, the feeling of being alone or helpless is what leads to thoughts of death. Your husband may just be in a dark place right now himself, and the Lord can work in him in time but since you are afraid for yourself and your child, I urge you to call an abuse hotline. 1−800−799−SAFE(7233).
You will not be alone, the Lord will lead and guide you. He is loving and wise, and protected me when I needed it. You can get your child protected from joint custody if you start speaking up for yourself and report the abuse to the police, and call the hotline. Ask for advice. Come back here please and tell us what you have done, and how else we may pray. Not everyone has experience with Domestic Violence or abuse, but I do and know this is the right advice. Forgiveness is not the same as allowing someone to abuse you or your defenseless child. Just make the call. I'll be praying a covering over you. And Do NOT engage in arguments with the man, remember, it's fruitless. I learned that the hard way and would spare you the exhaustion of trying that. The Lord may work in him in time, but right now, when he has been abusive of you and your child, you need to follow the lead of the Lord and do what the hotline advises.