Has anyone gone to a party?

El
I'm 26 weeks and my fiancés friend is having a party and I want to go but I've felt really weird lately like I have low blood sugar and I start to feel weak and sweaty. I also have swelling feet and sciatica pain. 
He really wants to go but I still have trust issues from when he cheated on me a year ago. I just don't want to be left alone during the party and I don't want to be a party pooper because I'm not feeling good. 
There's an option for me to go to the room and lay down but I don't feel comfortable with laying down while a party is going on downstairs. 
Has anyone gone to a party? & what did you do to make it enjoyable?