It's a helpful idea to look at anxiety as potentially energizing. I tend not to look at it that way. ha ha But it many ways, I would suppose we need a kick in the butt from some cortisol or other anxiety chemicals to make sure our list gets done. I'm wondering, though, if the pathway is thoughts->chemicals->anxiety or thoughts->anxiety->chemicals. The meeting of philosophy with psychology, though, interests me because I believe that philosophy and thinking can ultimately change a person's psychological leanings and pathologies. I've seen that happen in my own life! (Don't you love the day after Christmas? It should be national reading day or something... such a relaxed day!)