I totally understand where you're coming from, I took REG last Sat and I studied so hard, but the exam was brutal, beyond difficult and way tougher than the other three combined I felt. Since taking it, my gut has been telling me I passed and my head has been telling me I failed. It's just so difficult to know when exams are that difficult.
As for taking my mind off of it, I don't mean for this to sound rude to anyone, but I've just come to the realization that the CPA exams are pretty dang insignificant in comparison to everything going on in the world. My fear of possibly failing REG is so small compared to the fears of other people out there. Ironically, the night of my exam when I was freaking about how tough it was and if I failed or passed, my wife got an email from an orphanage in Mozambique she stayed at for three months on a missions trip, and asked for support as terrorists were going around villages near them and beheading, raping, and violently murdering men, women, and children, and burning the villages simply due to having a different religious beliefs. It was at that moment that I realized how insignificant REG was. I'm sure any one of those orphans would gladly welcome my fear of if I failed REG in trade of their fears of if they'll wake up the next morning or if they'll be victims of such extreme hatred.
I don't mean this to seem self-righteous or to make anyone feel bad for worrying about their exam, it's perfectly normal and natural to worry, that's the way the human brain works. Even since learning of the events in Mozambique, I still constantly worry and think about the exam, so I'm right there with everyone else. I just wanted to post this just to provide perspective. Hope it helps! But if it doesn't, I understand and sorry if my post came across as self-righteous and insulting.