Slow Panic Setting

My default setting these days tends to be a simmering under level of slow panic. I've done what I always do when faced with any sort of (real or imagined) deadline.  I've given myself more to do.  Basic, every day tasks linger by the wayside whilst I move silent screaming adding more podcasts, journalling, emails, research, essay writing, work, exercise, tasks to the my ever growing list of things I won't get done.  I don't like living like this so why do I keep doing it to myself.  Crippling myself with too much *should* dos.  Making mistakes, feeling the scratching throat of illness looming, worry, worry, worry.  Worry, anxiety and stress leaving me stuck in a situation I'm bored of putting myself in but it's part of a cycle that I seem unable to move out of...