I'm pretty sure I have a mild concussion. I'm speaking from some experience, as I've had one severe, two moderate, and four mild concussions, as well as a case of West Nile encephallitis. I know what it feels like when my brain's a little swollen. My head feels kind of cottony and slow, and I have a mild headache. My vision isn't distorted (relative--I'm horribly nearsighted), I'm not nauseous or dizzy, my speech isn't slurring, and I didn't pass out when I hit my head. So, no ER for me. When the only possible result is: "Yep, you have a concussion. Take some advil. Here's a bill for $6,000.00," I'd rather not. If I had insurance, I probably would have gone, and then had today off work. These are the choices we make.
So what happened? I was walking through the apartment in the dark to go to bed, and I turned in the wrong spot and slammed my temple into the corner of the wall. Combination of shock and fatigue and OW MY HEAD made me cry, but I'll be fine.