how to deal with personal injury in car accident

My best advice is to not sign anything with the at fault party.  Yes, they want your medical records.  They will be going on a medical records fishing expedition to see if you have anything in your past that might affect the value of your pain and suffering claim for this accident.  Insurance companies are just like any other business.  They want to make money - not pay out money (if they can help it).  They are NOT your friend.  It sounds like you may have a valid claim here and may be entitled to compensation for your pain and suffering.  Contact an experienced car accident law firm who can give you a free consultation to let you know what your rights are and what you may be entitled to.  At the end of the day, you will receive more in your pocket with the help of an experienced firm negotiating for you rather than doing it alone.