First, check your safety and move to a clear spot. Call 911 immediately to get...

https://victor-wiki.win/index.php/What_to_Do_If_the_Other_Driver_Leaves_the_Scene:_A_Paralegal%E2%80%99s_Guide_to_Hit-and-Run_Claims

First, check your safety and move to a clear spot. Call 911 immediately to get a police report on file. While you wait, document everything by taking photos and collecting contact info from witnesses. Get a medical check-up, even if you feel fine