Has anyone else been this situation?

My husband of 51 years, only diagnosed 1 month ago with lung cancer,which has also gone to brain. He has many other health issues, so decided too risky to have biopsy, to get treatment plan.

The last 2 weeks his personality has changed, he now has diabetes, caused by steroids. Im doing everything I can to make him.happy, but he just want to be alone, saying I have years, he has weeks.

It's really getting me down. The pallative nurse is visiting next week, do just hoping we can get some support.