anxiety and depression caused by curable illness destroy family

I unknowingly had severe anxiety and depression. It was caused by iron deficiency anemia that i was also unaware i had. My wife had told me i was acting differently, but i only told her nothing was wrong with me because i believed i was fine. I was acting with worry and was very irritable. She left me, taking our daughter and has never spoken to me again. We had a loving marriage for almost 20 years. After she left, i went to the doctor and was diagnosed with severe iron deficiency anemia, which i then found our anxiety and depression were major symptoms of. I was confident that once she found out why i was acting so wrongly and that it was curable, she would reconcile our family. Instead she said i was using my illness as an excuse for my behavior. I believe my wife has major stigma of mental illness and believes that it was on purpose or that i am a weak person for this happening. How can i explain to my wife i am a good person that a tragic accident happened to and save my family?