What to do if you get hit

[Fredwina]

Been there done that!
My two cents
get an attorney first! let them handle the battling insurance companies
yes, talk to the police. but let your atty handle the civil side(assuming the police don't file charges against you.)
CA also let file agianst Uninsured motorist.
document everything (photos of all injuries) , Don't fix any damage until the settlement is agreed to - you might need evidence later.
My atty recommend setting aside what you were wearing without even washing it - He liked that i had a bright PINK helmet and jersey
Yes, go and get professionally checked out both body and bike. and have some else pick you if possible

[OakLeaf]

Yeah, I should've been clearer.

Definitely you have to talk to the cop.

But you DON'T have to tell them what you think you did wrong. (Your fright-addled initial impression is probably wrong, anyhow.) If the cop asks you what you did wrong, tell them you're shook up and you need to think about it when your mind is clearer. If they don't ask you, DEFINITELY don't volunteer it.