Have you considered it might be something medically treatable? There are drugs for that sort of thing. I've tried some and wouldn't have believed it was possible before - aren't I anxious because I haven't done things I'm supposed to do and the consequences are nebulous and growing? Isn't anxiety a real signal telling me to get them finished? If you lose that feeling, you'll be even more screwed! But it turns out neurotypical people can be productive without being driven by stress.