You might be worried about nothing at all on monday, so try to get a reality check from a friend or family member. There's real stuff and then there's the stuff we make up to make life interesting. Things will be great for you later in the week if you can buckle down and force yourself to work (or play, whatever doesn't come naturally). Don't bite off more than you can chew this weekend. You'll have plenty of fun with whatever you already have lined up.