I think each situation is different. This one turned out ok, so i'll leave it at that.
Based on what you've seen - you have no idea how it will really turn out.
I fell and hit my head while ice skating and blacked out for a few seconds. After that, I got up (wobbily), got to the pond edge, got my skates off, and woozily made it back up the hill to my grandmother's home. I was still dizzy and queasy the next day. After a two-hour drive home, a visit to the doctor revealed blood visible in my ear. After an admission to the hospital I was diagnosed with a skull fracture and a concussion. I spent several weeks in the hospital, had double vision for a time, balance issues, many headaches, and thinking hurt. Meanwhile, on the outside, I looked fine.