Imagine finding out your mom has schizophrenia at age 55

She's kept it from me my entire life. I knew she was a really crummy mom in multiple ways & I knew something was wrong with her but I always made excuses for her in my mind. I can't help but feel very resentful that she never told me she has a serious mental illness. I found out by taking care of her in another state for 3 weeks thinking she had dementia, & she let a "metformin prescribed by a psychiatrist" statement slip. I researched this & know it runs on her dad's side of the family & is prescribed for psychosis/schizophrenia.