Suggest me a book written in 1st person about chronic illness

Hey! I'm looking for a book that isn't too long (for me, 700 pages is too much). The book doesn't entirely have to be about chronic illness but I'd like for there to be a character with it and it play a significant role.

I tend to be able to stay more connected to books told in the 1st person POV

*No character death please

What books would you recommend? With a little review or summary pls (no spoilers)

Thanks!! 🙂

Also pls something not too difficult to follow