How do I do it

I am caring for my wife who was diagnosed with a blood cancer and is taking a chemo.pill daily for the rest of her life. Along with this she was diagnosed with some autoimmune disorders which also mean medication for the rest of her life. She is understandably confused sad angry and frightened as to what's next, what the next blood test will turn up. 

She is extremely tired a lot of the time, if she has a good day and gets out and about she then has a few days completely warn out.

Added to this she had a very large melingioma removed at the start of the year which has affected her motions memory and cognition.

I can work from home some days but have to in on others.

I don't know how best to manage caring and working and not being stressed with her.