Often times it isn't even something that is going on at my table. It's something else in the space we are in. Aggro energy coming from a near by table, or creepy vibes from the hovering dude. I'm working on expressing what is freaking me out to my table mates, but most of the time I don't know until after I've gotten to a safe place and can think about it calmly. I'm training myself to say,"I feel anxious. I need to step away," rather than being like, "Fuck you all, I'm outta here."
An old friend of mine has some kind of health issue that limits him to two hours of boardgaming at a time, with lengthy breaks in between. He is fine with using that break to grab some food, take a walk, or watch a movie. So far, nobody has had the nerve to ask him about the nature of this health issue, but maybe it is anxiety. Prior to developing this condition a few years ago, he played board games more than anybody I know. This is the same friend who broke both the Minneapolis and Saint Paul curfews during the riots last summer, just to play board games with some acquaintances on a week night. He also started spending winters in Florida a couple of years ago, for unspecified health reasons that are probably not related to anxiety.