This includes physical therapy notes and a doctor's narrative. These items are what the insurance company will review to make a determination on the amount of money, if any, they will pay on the claim. Also, if applicable, take photographs of your injuries. If your injury is a visible one then a photograph is worth a 1000 words. Broken bones, casts, scars and other signs of injury are best shown rather than told.
Photographs are extremely important for other purposes as well.
Rest assured that the insurance company will have their own photographs that will tend to minimize the damage to the vehicles. Take yours from the most advantageous angles. Show all of the visible damage. Take pictures from below your car as well. This can show the frame damage that is not visible from a higher angle.