Are mental health records admisable in court proceedings against someone

My case is old and I've been in deep depression for years until now. I went on bing and typed mental health records admisable in court and the first paragraph states they are beyond here say from the other party. Recorded phone conversations from prison recorded by the state are they admisable as well? I can't obtain the recorded conversation myself and need to find an attorney that can obtain them I heard it takes a grand jury subpeona to obtain them and use them as proof of financial exploitation against my stepfather I'm assuming here say is here say and facts are facts in court.