its important to tell people your expectations in the hospital. You are your own best advocate.
I hope you mind some sharpshooting but I would recommend you invest $20 in a ankle bracelet at roadid.com. That one piece of kit would have solved all your problems giving info to the first responders HAD you hit your head or gone into shock.
As for the hospital care, you may wish to get a business card from every person who treats you and the name of the group that bills for them. I know there are medical personnel on this forum but from personal experience through my sons tremendous medical bills, (and quite a few of my own) I have seen probably about 8% of my bills as bogus. Such as the doctor who billed me $400 for treatment. Since I did not have his card, I challenged it and found out he merely looked at my chart at the nurses station and billed me for his consult.
But for the most part, you get individual bills from the hospital, the doctors, the nurses group, then the extras like the surgical staff (anesthesiologist, etc) and it gets confusing on who you saw/who saw you/ and how your getting the bill.
Welcome aboard.
_________________________
Don't just survive. Thrive.