Happened to me when I woke today. I felt perfectly fine the last few hours before going to bed the other night, but when I woke up, I knew something wasn't right when I got up feeling like I only slept for 2 hours. For the rest of the day, I stayed in bed while my head was hurting, my stomach was in pain, my back was killing me, and my piss hurt. I still feel like crap as I write this, but better. This better be gone by tomorrow.