Start by moving to safety and seeing a doctor immediately, even if you feel...

https://foxtrot-wiki.win/index.php/What_Does_a_Car_Accident_Attorney_Actually_Do_for_a_Claim%3F

Start by moving to safety and seeing a doctor immediately, even if you feel fine. Call the police to get an official report at the scene. Take photos of the damage and grab contact details from any witnesses