Chiari malformation (compression of the spinal cord at the base of the skull) can cause your bowel and bladder symptoms. A fall can aggregate this condition and cause further dysfunction of the cord.
An MRI of the brain should include the cervical spine as these Chiari malformations can be associated with a syringomyelia (a swelling of the middle of the spinal cord).
You need to get into a base of skull specialist to have a full workup. Do not hesitate on this.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.