Yes, I had guessed, but just so glad to hear from you. Will you stop being so hard on yourself, and you are letting no one down. Work and performance stress is a BIG factor in all our lives and you cannot go on such a demanding diet unless everything else around you is stable and cool. I know when I started SS+, back in June 2008, I cleared the decks workwise for a week, so that I could focus completely on getting my head around the diet, and just sleep if my head was playing up with the head hunger etc.
Have a go at 1000 cals at the weekend by all means. You might even find that it helps with the stress of essay writing to be in control of what you eat. It might even clear your head a bit. But if you need to snack to meet your deadline do NOT think you have failed, it is just not your priority at that moment in time, your essay deadline is, that's all. And certainly do not believe that CD is not for you. Maybe SSing isn't, but for every meal that you have a meal replacement instead of something carby and calorie-loaded, lacking in the same nutrients CD gives you, then, the way I see it, you are ahead of the game. Little steps Gem, little steps. I lost all my 5 stone and 4lbs on SS+. I didn't SS for a single day. The laws of physics, or whatever, say that a woman will lose weight on anything less than 2000 cals a day. Never forget that. If you chose to do it a pound a week on 1500 calories a day, that is still losing, not sts or gaining, and you are still ahead of the game.
Hang in there, and STAY IN TOUCH!
Lots of love
Francesx