hit by car

I was walking to school last Monday morning before crossing the steet I looked both ways as usual didnt see anyone so I walked into the steet it was crazy I didn't feel Getting hit nor did I remember it I woke up on the ground wondering what had happend the lady toled me not to move she was going 40 in a school zone.said she was In a hurry long story short everytime I lay down I get dizzy and also when I get up from my bed is that normal or bad??