I had a auto accident 12 years ago in florida now I am in california can they go back 12 years and find the accident or medical records

I was involved in an car accident Tuesday..I was stopped @ red light and a car entered my lane and slammed into me..the guy that hit me was a mechanic driving a customers car..he admitted that he was distracted by a police car and rammed into my car..I’m now without a car and the business insurance is wanting me to pay for a rental upfront..I went to the ER after the accident and was told I have a severe back strain and to take the next three days off and stay in bed..what r my rights in this matter…I have never been involved in a accident before..anyhelp would be grateful..Attorneys are gratefully welcome to respond..thanks..
the car I was driving WAS a rental..I had carpal tunnel surgery 3 weeks ago and my car is a standard..so that makes it impossible to drive..I was prepaid for my rental for another week..but Enterprise took the car and kept my monet until they get the settlement on the car..