I'm experiencing this right now. My productivity at work is dropping to nothing. Looking at the code base is getting harder and harder. Unfortunately, I am under a mountain of debt and am responsible for 3 other humans, so trying something new is not an option. Note to young programmers: please manage your finances wisely and not fall victim to the "they have X, so why can't I" syndrome. There aren't too many fields where you can make the kind of money we do, so don't trap yourself financially--it closes too many doors.