Husband Settled On Birth Injury Case Behind My Back

So I have reason to believe that my husband settled on behalf of my son and I in a birth injury case, and established a trust for my son. Also, I believe that he took another woman in my place to sign.

To confirm that, I requested my hospital records and they are missing all the information regarding my son. also they put for the location and patient type n/a. Also my husband spent 400k plus in cash on properties last year. He also took a lump sump; 50k according to him, over seas when we traveled last year.

My issue is how can I find out the details of the settlement and the trust. I contacted the hospital twice and they are unwilling to provide me with details. i looked up the county’s clerk of court and there are no cases under our names.
how can i prove identity theft? How can i find out the details of the settlement? What type of lawyer should I hire Or is there a way that I can do some digging on my own?

I appreciate any and all feedback. I was so devestated as I really wanted to sue the doctor for her negligence but my husband didn’t allow me. But now looking back I realize that he didn’t have the final decision.also I’m devastated that he went behind my back.