Dealing with a difficult custody dispute.

Backstory. My mom and my dad got divorced back in 2014. Ever since then my mom has had a burning hatred for my father. I currently live with my mother, grandparents, and uncle (he’s a maniac.) Recently my uncle has tried taking my life via vehicle. Me and my grandma constantly argue and it’s gotten to the point that she says she hates me. My mom hates her life so every time she gets back from work she will start yelling at me to take her anger out. All she talks about is child support and how she wants revenge on my dad (i assume she’s angry about the divorce that happened over a decade ago)

Onto the custody dispute. This summer I had to visit my father. Me and him have never been too close due to distance (And my crazy mom). I came to him asking for help and to remove me from this situation. He agreed to get an attorney and modify the custody agreement. When we first told my mom she went ballistic on me. Said rude and hateful things about me and my dad. She said I betrayed her. Later that night she sent me and my dad paragraphs about how I betrayed her and that she is going to fight this. she just wants me back for the child support money. She had made it pretty obvious. For this past week she had sent me paragraphs and paragraphs of rude messages to me. I have to go back there this Saturday. And honestly. I’m scared. Shes mentally unstable. I don’t know what she’s going to say or do. I’m scared to go back. But I have to due to our fucked up legal system. I fear for my sanity when I get back. Oh and to make things worse I lost the only person who has ever truely loved me. My girlfriend. I also lost most of my friends before this too. Oh well. What can I do about it? If you want more details don’t be afraid to ask.