Should I still carry on working

I have had cancer, 2 years ago, and since treatment have developed other issues including fybromyalgia, I'm getting uc and lcwra, I'm 59, single, I still work a few hours part time but can no longer do the job like I used to. With the pain I now get I'm struggling more and more. I chose to do a few hours to help my mental health as I live alone. If I hand my notice in will it affect my uc, I just can't decide what to do any replies would be welcome