You are soooo not alone. I have to go to a work party today and was up most of the night. I did not make it to the party last year, I was too sick also.
Don't worry about others knowing that you are seeking help for your issues. The strong people are the ones that seek help to get better, and work hard at it, like you are.
Can you do some yoga, or deep breathe today? Do what relaxes you?
Just remember it will all be over by tomorrow. We've only got a month left and the holiday stuff will be over. We can do this!