Can police intimidate you?

Sounds like you made a bad decision to contact the police with a letter at all. Why in a million years would you do such a thing?

Signed release of claims, did not get all $ agreed to, can I still sue for the rest? Don't have attorney.

Why not call and ask what the problem is first?

Two...no need for a court reporter, most likely.

I was involved in an hit and run accident where the driver of the motorcycle left his bike and walked away from the scene.

OK...

Do I have to get a patient to sign their name to refuse administration of a vaccine on a vaccine consent form? Is that legal?

A signature is a signature.

Hit and run car accident ?

Tell your insurance co. and look into a criminal defense lawyer.

Patient rights in Mexico ? Medical Records access>Deceased brother in hospital care in Rosarito BC MEX

Get a lawyer in Mexico.

My car was towed wrongfully do I still have to pay the towing company?

Most likely yes.

Is Tendinitus in the shoulder covered under workers comp?

Most likely yes. Get a WC lawyer.

Can my passenger still sue me after he signs the paper saying that my insurance will cover him?

No idea. What paper, exactly, did he sign?