Glad to see you back. And I'm glad you went into the office on Sunday. Normally I wouldn't encourage Sunday office hours but it sounds like you will be able to decrease your anxiety by catching up. In a way you are also making amends to your place of work because drinking caused you to fall behind.
As far as the work week goes, as with alcohol, just take it one day at a time. I had a terrible Monday in the office last week (in the old days I would have had a drink or 12 Monday night) but I just kept trying to do the next right thing, hit an extra AA meeting, and by Friday I was feeling really good about my work week.