I feel a like that, too. It seems to me that I avoid stuff that I don't like to do as if that stuff will multiply. I
especially hate to file things away. It's retirement syndrome for me - that stuff feels too much like WORK.
Pain has been my constant companion for over 25 years and I know how to mentally ignore it for hours at a time. But at the end of the day, it suddenly hits and then fatigue overwhelms me. Curiously, when that happens it is difficult to sleep at night. The brain goes into overdrive and thinks about stupid stuff, long over, long resolved, as if it was happening right now. No sleep for the weary.