how to decide between treatment and quality of life

I have been on continuous treatment for mets now for 4 years, 2 of which have been chemo. I was very ill earlier this year and didn't think I had much time, but was lucky to have had a good response to my latest regimen. But as time goes on, it is getting more and more difficult to tolerate with more and more side effects. I find I am spending at least half my days in bed and on the days when I get out of bed, I am backing napping several times a day.

Even when I am up, I don't feel well.

How do you all balance effective treatment with quality of life?

I have 2 teenage kids and if it weren't for them, I wouldn't have been nearly as aggressive in my treatment.

Any thoughts, views, experiences, would be appreciated.