You really should be seen by a neurologist or neurosurgeon - it is possible to have your symptoms in a condition called cervical myelopathy, where, for some reason (car accident, in your case) the cervical spine becomes degenerated and pressure starts to build on your spinal cord.
A MRI of the cervical spine will be able to see the nerves and spinal cord, and would be the best test in this case.
If you've already had a cervical spine MRI which was clean, then you should be seen by a neurologist for workup of other neurologic diseases.