What can YOU say in six sentences?
Having a concussion means that you hit your head hard enough to make your brain jostle a bit and hit your skull, leaving the brain itself bruised. It swells up a little bit, to cope, and then when it swells enough to touch your skull again, you feel this immense pressurized pain.
Your doctors will worry and scurry and try to make you sit still and not think at all about anything, and especially don't focus on one thing for too long because that could be very bad for your brain.
But all the time, your neurons are firing little messages to each other about how hot the doctor is even if he's old and how sitting and doing nothing is harder than it sounds and how thinking about not thinking is equally dangerous to thinking about the doctor and how your head feels like a balloon blown up into a plastic bottle and how the doctor's mouth seemed to move so much while he was talking and how your mouth felt like it was going to explode because of the pressure.
And amid all the jumble of thoughts and phrases, your brain is working diligently to fix itself.
So the doctor shuts you in a dark, completely dark room for hours on end, without light or TV or doctors or reading or anything and you try your best to turn off your brain.