Infection from cervical surgery can occur but are exceedingly rare. I am unclear why you would have slight fevers. Frontal headaches can occur from the cervical spine especially if you have degenerative facet disease of the upper 3 vertebra. X-rays including flexion/extension would be my first thought and if suspicious, a CT scan should be considered.
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.