Surgery can cause further symptoms in a case of severe canal compression. The surgeon has to place tools into the canal when decompressing the bone and this added footprint can increase the cord compression. I assume this is what has happened in your case. All your findings are consistent with cord injury (“Clonus, Hoffman’s Reflex, Hyperreflexia, babinsky, restless leg syndrome, sleep apnea, and wide gait in walking”-except the sleep apnea). See https://neckandback.com/conditions/cervical-central-stenosis-and-myelopathy/. The canal is now decompressed (“The central canal is patent at these levels of surgery”) so you are probably in no current danger.
Neck pain should be reduced after surgery. Because it is increased, I would want to know if you have a solid fusion or if one level did not fuse (pseudoarthrosis). This would require X-rays and a CT scan.
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.