hi, this is dr.syed minhaj ahmed.
Before i answer your question, want to make it very clear tht there is a lot of difference between in lack of mobility ( may be due to pain) and loss of power( may be due nerve compression / injury
These symptoms as mentioned may not be related to the fall at all.It seems to be a part of cervical spondylitis
. Neck and back exercises with rest and T.gabapentin
100mg h.s should do the job.