The CT scan is not the best study to look for migrane or lightheadedness origins but if there are degenerative facets in the upper cervical spine, these might show up on this scan. There is no report of these findings.
“Going numb from the wrist to the finger tips” sounds more like carpel tunnel syndrome (see website) than cervical origin.
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.