Family reaction to my brain tumor (meningioma resection) was bizarre

I was reared with a large loving family. My meningioma was discovered by my blindness in my one eye. I had to rush to have the tumor removed. My daughter came to assist and be there and my husband was drifting there oddly aside. I did not know he was having an affair so his mind was elsewhere. My mother and sister, who were in close proximity ,offered little guidance or support. My daughter handled helping me bravely then went back to her home. My husband asked for a divorce and became violent. I was just learning to walk again and gaining enough strength after surgery. My family, who I knew my whole life to be supportive, absolutely disappeared. They don't call, no contact and never have. I finally am strong enough to go back to teaching and trying still to be positive, but what has happened to people? How can my family just eliminate me from their lives and just not care about another person especially family. I am deeply hurt and just puzzled. Is this a common reaction and response ? What do I do?