AnnieMouse, you probably couldn't find the book because the title is spelled wrong here--it's Shopping Brake.
I don't think impulse control is your next step. I think your next step is meeting your needs for pleasure, comfort, diversion--those needs that are currently being met by shopping. If it's specifically feeling bored and frustrated at your desk, can you make your work environment more pleasurable? Art? Flowers? A beautiful lamp or pen cup? Can you listen to music with earbuds? Can you get out in the sun for five minutes now and then? If you have a lot of down time to fill, is there something you've been wishing you had the time to learn? You can't learn to ski at your desk, but what about a language, or...? Ok, so I don't know your situation and all these suggestions could all be way off the mark. But I'll bet if you step back, you can think of more ways to please and occupy yourself than just shopping.
Sterling and DonnaF -- You've identified a wardrobe hole for me! Not loungewear, because I'd have to get up and change into it, but better pajamas! And more of them, since they get so much wear. (My husband thanks you.)
Sterling, I totally sympathize with the sugar addiction. I have sat at a party and eaten every single piece of candy in the bowl on the coffee table, acutely aware of everyone watching me do it, but unable to stop myself. If abstention is working for you, more power to you.