Traumatic brain injuries dont always show
https://edgarlacf015.ironwoodscope.com/posts/what-to-do-in-the-first-24-hours-after-a-san-antonio-car-accident-3
Traumatic brain injuries don't always show up right away. My uncle had headaches for weeks after a crash before anyone connected the dots. If you hit your head at all, get checked. It's not worth waiting to see if the headaches go away