Jenn, how scary it must have been! That is quite the tumble.
Try not to stress too much about it today and tomorrow.
I am sure it is very frightening. Think about how after you heal, you will feel so much better!
I wish you the best of luck. Just a small suggestion that will make you feel better-have you filled out a simple health power of attorney? If not, ask the hospital for one when they check you in. Johns Hopkins is a wonderful hospital. My brother had a liver transplant there and continually goes there for follow-up care. I've had a couple cervical surgeries so I know the nerves are with you but you will feel better after it's all over.