DannyT, your story is almost a copy of mine.

I suffered the first concussion on 30th september. I was fully recovered in the last days of october. The second concussion happened on 21st of November.
I also didn't notice it at the first moment. The next morning was the point when I realized what happened. Since that day I am not able to do anything. No TV, no smartphone, no reading, and very little computer time.

I am also a student at university(like you). I took complete rest for the whole semester, hoping that I will be fully recovered when the next semester starts.

So that driving incident throws me definately back, I can't estimate how far(3 days passed and no real improvement). How did the situation develop in your case, after you had this rough car ride?