Whether impact has any real medical or scientific correlation to injuries is a subject of some debate. However, juries and insurance companies do evaluate claims based on the amount of property damage sustained by each vehicle. In dealing with insurance companies it is typical for them to consider only the damage to your vehicle. This is not a great surprise because in rear end collisions it is usually the at fault vehicle which sustains the most visible damage. Medical information, medical bills and lost wages.
Documentation is critical.
Insurance companies will only pay for documented injuries or lost wages. There are many factors that a jury may consider as elements of damages. However documentation is essential in a jury trial as well. Also, be aware of the possible sources of compensation for your injuries. There are many drivers on the road who do not have insurance.