Idk what to do anymore..

Pjay
Not sure if this is the right group to post in. Sorry if long. Im just so lost and broken. I left a very mentally abusive relationship of 6 years. He is a drunk amd extremely controlling hes 36 and im 23. Anyways we have 2 kids. I have took him for childsupport and now hes threatning to go for full custody or even half just so he doesnt have to pay. Im all for him seeing his kids but not like that due to past reasons that i obviously have no proof to show court. I have been basically begging for him to take kids for 3 weeks now just for a visit cause my 4 year old has been asking for him. But just wont. Hes driving me crazy. Idk how to keep my head straight. Hes threaghting that he'll just take them. Saying they dont live in a stable home, Telling the court my mother is suicidal, my gma is a drunk and me as well iv been in impateint after him telling me to just die multiple times. Please give me advise. Im so lost. If i lose my kids i dont know what ill do.