Yes good idea Leah to get some outside help now as I have said in the other thread you have done and in my PMs to you.you do not need to have anything to do with him, speak to the lawyer your Mom has for the court hearing, Good Luck
I saw that you posted in a few communities looking for help. I have a hotline that you can call anytime from anywhere in the US and Canada. Please use it, as much as we can support you, we aren't a replacement.
http://www.childhelp.org/get_help
1-800-4-A-CHILD
Please talk to your school counsellor, they are trained to handle stuff that's going on with you. Please do this as soon as you can, you don't have to go through this.
Speak to someone who can help you. Perhaps a counselor at school. And there are hotlines to report this to, that you can call on your own to stop it. Depending on age there is Child Protective Services or Adult Protective Services. Get to a safe place and call from there.