I assume your fusion from occiput to C3 is the Klippel Feil syndrome.
C5-6 foraminal stenosis will cause symptoms from the C6 nerve. See this hyperlink to see if these symptoms fit the picture.
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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.