Using a diary will be invaluable to you right now. Don't feel bad if you withdraw at work - I do all the time; I just sit in my corner with my iPod and only interact when really necessary. On your good days your productivity will sky-rocket! Don't feel guilty.
Divide your diary into 2 columns - a MUST do and a Eventually do. Put a check box infront of each item - it feels really good to check the DONE box :-)

And then keep a journal to write down your feelings and emotions.