How to file a case for the mental abuse that my uses to blackmail me?

I was married for 13 years and was the main income provider to my husband and daughter, bearing all expences. My husband first fell into an affair, then we divorced.

After realizing that he can not benefit from my earnings anymore, he started to demand from me money for our jointly mortgaged home which I keep and was paying solely despite it being on 2 names in the mortgage contract.

So together with his mistress, they decided to act as i am abusing my daughter - which is not true. He was making up stories, going to police and hospitals taking reports, and letting his mistress attend doctors with my daughter without my knowledge.

He is using this to blackmail me to mentally abuse me, teaching my daughter to lie and manipulate me. I want to file a case and prove the abuse, blackmailing, and psychological damage to my child and me.

What is the medical facility where I can get a psychological behavior report for my child to prove that he is doing this all on intention and consistently to fulfill his financial plans?