My question involves a marriage in the state of: Michigan

I married someone who I didnt reallize was mentally disabled. Her parents have revealed that she has a documented history and spent 2 years in a mental hospital. I didnt know this before. Now she has declared she never loved me and left, also many other crazy things. Its only been 6 months. I want an annulment cause she clearly wasnt what she said she was. How can I prove her mental history if I cant get to her medical records due to privacy laws? Any suggestions for me?