Ok I live in Indiana and it was snowy so i did some donuts and then some more and then some more. Now when I drive my car it shakes. Its not the road. The passenger headrest shakes and when my friends sit in the back they notice its. It wasn't like this 2 weeks ago. What need to be done. I hope i didn't bend a rim ( had a friend do this to his subaru). I think i need a balance or alignment. My friend who works at a shop will do the balance for free. What should i do?