Call 911 and wait at the accident scene until law enforcement arrives. In Michigan, it is illegal to leave the scene of a reportable accident unless it is for emergency medical care. Around here, the most likely agencies to respond are the Ann Arbor Police Department or Michigan State Police. Get checked out at the scene by an EMT then go see a doctor for a more thorough examination. Trauma care services are available in and around Ann Arbor at places like University Hospital, St. Joseph Mercy Ann Arbor, and Advance Urgent Care. You should also contact an Ann Arbor car accident lawyer so they can handle your claim while you heal.