DD, you're on day 6, don't worry so much about that stuff. It's only going to drive you into a relapse. Do as much as your comfortable with, and first and foremost, concentrate on helping your body rejuvenate. Your body will do it on its own, but you can help it -- proper diet, exercise, laughter to relieve stress, good sleeping, etc.
Even try to sleep more than normal, because your body rejuvenates far faster asleep versus awake. The rest will come in time. Your body and mind are fighting right now, and doing their best to get you back on track. Help them out, instead of fighting against them.
If it helps, I'm in the same boat. My mind is currently complete mush right now. I've technically taken a 66% pay cut, because I bill hourly, and it's taking me three times as long to get anything done.