Be careful regarding upright MRIs as they are over-read and issues are found on films that really don’t exist. A carefully performed MRI scanning Occiput-C2 (which have to be specifically ordered) and a CT scan of this region would be the imaging of choice. Then, possibly a diagnostic injection by a well-experienced injectionist to confirm and treat the disorder could be considered. Don’t forget that vascular phenomenon (vertebral arteries) can also cause your symptoms.
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.