Advice Please!!!

My boyfriend and I are going to spend the weekend with his family this Saturday. I'm beyond nervous. I've met his family before a few times but I've never spent enough time with them to really get comfortable with being around them. I'm really worried about eating dinner with them.... It sounds stupid but I've got major social anxiety and for some reason, eating in front of people freaks me out. I need advice on how to get over my extreme anxiety so I can really enjoy this weekend.