Court ruled in my exes favor

Me and my ex broke up when our daughter was 2 because he had so many mental health issues and it just became really hard. He wasn't a bad person but it felt like I was caring for two kids some days. He has Dissociative Identity Disorder (multiple personality disorder) and he's been a rollercoaster. Our daughter is 8 now and he had visitation but he took me to court for joint custody and had his therapist testify for him. She said he's had his final fusion and it's a little confusing so how I understood it is he has multiple personalities. Personalities can fuse together. Final fusion is when all the personalities fuse together and become one. From my understanding it's the goal that they hope for with people with DID. I did feel bad for my ex because he was crying saying how for the first time he feels one. He hasn't had trauma symptoms for over a year and he wants split custody because now that he's one he can enjoy memories with our daughter and remember them all(DID can cause gaps in memory). I just worry about my daughter being around him because of his mental illness. I don't think he will hurt her but I also don't feel comfortable with her being in his car so long periods of time. Plus even with final fusion it's not the end of treatment for DID. He will still have to be in therapy probably forever. But the judge ruled in his favor and he will get our daughter every other week. How do I calm my anxiety about him being with her? I want to throw up knowing Friday I have to send her with him for a week and I can't get my anxiety to calm down.