Well, at least you know that you are not alone! There are so many of us in that boat with you we are going to have to trade it in for a cruise ship. LOL
A lot of us also have health issues that mess with our minds and make the most simple calculations become magic tricks that we don't have the directions to.
I just see some of the results as creative opportunities, and other results as pieces to add to my orphans box so that they will become part of a togetherness quilt in the future.
My rules for quilting are these: be kind to yourself, have fun, share the joy.