@Angelo
The decision is personal and it sounds like you're at the crossroads. Don't consider it as giving into the disease, if you decide to finish work but rather looking at it as a new chapter. A new chapter without stress perhaps.
I had a friend with Mets and her fatigue and continued treatment meant making the work life balance a priority. Work gave her a project which she completed in its rough format and her friends stepped in and formatted her documents into a finished project.
Enjoying time with family and friends and making memories and still feeling useful with the project she had helped her cope.
There's no right or wrong approach it's what you are comfortable with!
Best wishes and here's to ongoing health improvement.
Take care