Co parenting

So my husband and I have been separated since March 2016. He was very abusive and a cheater the last two years we were together we have an almost 3 year old (01/02/2015) my son was 1 when we separated. We had an agreement amongst ourselves to take turns almost every time my son went he would threaten to take him from me. The last time my son was with him he had a head injury and was in the ER. When I went to pick him up he wouldn’t give him to me because I was with my guy friend (he was my ride) he told me to come back with my mom, I called the cops but they couldn’t do anything since were married. I went back with my mother a few days later because he wanted an agreement with her first before anything. We go and he finally gives him back. After that I didn’t let him see him anymore, I was scared of him and knew he would do anything to hurt me. Once I had my son back that was it I wanted him out of our lives. At first he wasn’t having it would blow my phone up all the time .. after a month it eventually stopped. I went on with our lives. I got with my guy friend and he has been in the picture ever since. We finally went to court this month and he wants full custody and to only give me two visitation days. Which is ridiculous since he was the abuser. Well temporary custody went to me till Jan 2nd which is my sons bday which we have to go to court on that day for mediation. He gets him Christmas Day for a couple hours... I’m having the worst anxiety over since my son has no idea who he is. But I was thinking and forgot to ask if he doesn’t come with a car seat so I have to send him with him ? He told the attorney I didn’t have to supply anything since he has for him . But what if by chance he doesn’t come with a car seat expecting me to give him mine ? Any advice about anything will help been a stressful last 3 months.