I'm sorry to hear what happened; this is a Worker's Comp injury. Did you have an MRI in the ER? Did they say what "fragment" in your neck was affected and what was wrong with it?
Did they give you a neck brace or refer to you a Neurosurgeon or Ortho MD?
Did they give you any medications?
There is a User Group called "Traumatic Brain Injury (TBI) with a lot of resources/links on it that you might find helpful for your concussion...take a look at at. I run the group.
I suggest that you rest, don't push yourself and this will help you heal quicker. As for your neck, we need more info. I hope they are keeping you out of work in the meantime, otherwise get yourself a good Worker's Comp. attorney.