I can totally relate.... I got to 777 days before I just lost it and completely fell back to my old ways. But, I'm not as bad now as I used to be. I don't do it daily, and not as badly- only sometimes, when the urge gets overwhelming....
Good luck- I know 3 weeks feels like forever. There's a Kelly Clarkson song called 'Sober', you should listen to it. It's about 3 months, not 3 weeks, but I remember when I got to 3 months, I just loved how much I could relate to it.
Anyway, keep going- you're doing great! :)