How do prove that someone's emotionally abusive when it doesn't leave any physical scars?

I just had an argument with my ex because my daughter called crying from his house to come get her. She'd been back there all of an hour. He said there are issues that we need to discuss. He's accusing me of lying and turning my daughter against him. He says I'm on drugs "you're on crack." I told him I'd be willing to take every drug screen known to man and they'd all come up negative.

I can't take it any more. I'm not perfect, but at least I'm protecting MY KIDS and not an overinflated ego and self importance like he is.

He told her she wasn't welcome there and that he was going to call me to come get her, then he hung up the phone and said he'd rather she suffered. When I told him that's what she told me, he says "yes, that's what I said, but it's totally out of context. It's to prove a point." What point is that? When you tell a 14-y/o girl to basically get out and go to her mom's, that's how she's going to interpret it, not how a 43-y/o emotional abuser interprets it.

I'm afraid I'm going to lose my kids over this, because he has my brain so twisted around that I don't trust myself any more.