You've done fantastic, Serenity, especially as other people were drinking around you last night.
I found it really hard at first to be around people drinking. Even now I don't go out for an evening if I know it's going to be just about drinking because I tend to feel a bit left behind at about the fourth or fifth round. Happily, this is apparently a common issue amongst lots of people who don't drink including non alcoholics!
It's not that I want a drink because I know exactly where that will take me and the truth is, that for me, it's just not worth it. I remember that always.
It's completely understandable for you to feel anxious and low in mood. You are going through a whole lot of stuff right now. Who wouldn't feel worried and sad? You're doing a really brave thing. Keep going!