I know how you feel. Although it sounds mad, and please bear with me, I found my routine to help for huge expts! I plan the day before where I should be by break, lunch, coffee and cake time etc. It breaks up the impossible task into little mini goals, then i can reward myself with chocolate/human contact :) without feeling guilty. Only when im in control do I dare check my email (facebook is worse!). I also get in as early as possible to give myself plently of time in the day but also to start off the day on my own, so I can get my head around the task without people asking questions etc. hope you find a solution :)