Hi immri, I hear ya and commiserate!
About your work brunch tomorrow -- please do have at your ready as many tactics as possible.
Temporary exit strategies (even if just to walk around the block outside), an explanation for not drinking (if asked, if you feel like responding to the asinine question), if you have anti-anxiety meds and think you might *need* them -- keep them handy, stand next to a sober friend, keep your paws filled with canapes, keep your eye on the clock for half time and then soon you're half way there... and then you're almost through... look forward to some ice cream at the end of the day? I know there's better tactics out there... anyone?
And when you get up, awake and ready to face the day, take a long deep breath. And then another. This day is yours for the making.