AnnieD,

There is likely a questionaire that asks about recent concussion and concussion symptoms. I know these questions are on an FAA flight medical questionaire. Are there special doctors the DOT uses for these exams ? If so, you would want to ask this question of one of them if possible. There is likely an online source of information about these issues.

If this DOT exam is to drive a school bus, remember how chaos can cause a relapse/confusion. A bus is too great a risk for chaos right when there is a need to be on top of your game.

Please be very careful about considering driving as a commercial driver.

I did a quick google. Head/brain injury is the 2nd question in the medical history section. It will likely require a doctor's clearance. The insurance company may have even stricter standards.

My best to you.