I've been through EMT training long ago. My daughter did it a few years back. I doubt the background is about health. It will be about criminal record and drug abuse and DUI's and sexual crimes.

You will do yourself a great disservice is you try to hide any of your symptoms. If you make it through EMT Basic then can't get past EMT Advanced or EMT-Paramedic, you will have invested time and money for naught.

If your goal is ambulance EMT or Paramedic, that will be a stretch considering your brain history. The sounds and flashing lights and stress will be difficult to tolerate if you have any struggles now.

Please be sure you can tolerate the environment of your eventual job goal before getting started.

My best to you.