Print out a copy of your post and put it in your shirt pocket where it will be close to your heart and stay in your mind.
Have an exit strategy in place and use it if needed. If any thing is to be said before leaving..."I just had a personal situation come up that I need to take care of so I have to be going" works just fine and is totally honest. Otherwise, just leave.
I know that for me, non-alcoholic beer was not a good solution, especially in a environment such as this one. Might work for you, I can't say, I just know it wouldn't end well for me. It would be like striking a match while standing next to gas burner in the open position.
Remember that you are in charge of your life, no one else is, their opinion's are secondary.
Be careful. Be strong. You can do this. If you have any doubts, don't go. "I didn't feel well, so I thought it was better to stay home." Works fine and is totally honest.