Hi, AdeleSA,
Welcome to CWE!
I'm sorry about your car accident. There's been a ton of research on football players and soldiers. Even a small accident with a mild head injury can damage the brain. Especially if it's been repeated concussions over time.
Here's an article whose orignal source was the United Staes Centers for Disease Control (the government):
http://www.headinjury.com/sports.htm
I've had so many minor head injuries I can't even count. Some from sports, some from a couple of car accidents. Only one of the bumps on the head made me unconcious, and that was only for about 5 minutes. I don't know if that's what caused my seizures, or if it was inherited (we think my father had epilepsy), or if I inherited it and the head injuries made it much worse.
I bet if you reflect over your lifetime, from when you were a small child onward, you or your parents will think of times you hit your head. As a toddler hitting your head on the coffee table or the cement, as a kid falling off your bike, as a teen playing sports, etc.
Since they caught your seizures early there's a chance you may be able to get off your meds someday. It happens to some people. Other people are on these for life. I'm surprised that your doctor is taking you off your meds. Most doctors probably wouldn't even try taking you off until you are at least 2-5 years completely seizure free.
On this site there's advice on going off this stuff, but remember it isn't a DOCTOR's advice. It's highly recommended that you get a doctor's help in doing ths. The advice on taperin off is way down the page, so click and look about half way down.
http://www.crazymeds.us/depakote.html
I don't agree with that site. I think you should go off over weeks or months, not days.
Nakamova is right. Going slowly will help your brain adjust and be less likely to bring on a seizure. Since your doctor is not replacing Depakote with another drug (so you'd be on another drug when you are tapering off), then you need to go extra slow. When you go down to the last few dose drops, I've heard you should do it even more slowly.