Have you ever had levels of anxiety that basically prevent you from doing anything productive?
@jerry Yes. When my brother was dying, I warned my boss that my productivity was going to be shit for a while and I was just showing up in order to answer questions and help others when they get stuck. There have been other times when I got professional help. Once, when I explained my stress-related symptoms to my doctor and he referred me to a psychologist, the psychologist said "you seem pretty well adjusted... wait, you drink how much coffee?!" So yeah, try to cut down on caffeine.