You reply that you had good but temporary relief from your facet blocks. I pay great attention to the diagnostic portion of the block- that is the first three hours when the numbing agent is active. If your pain was substantially relieved by the block for this period, you may have facet inflammation. Ask your surgeon if you might be a candidate for a rhizotomy (see website) a procedure that can disconnect the nerves that travel to the facets.
Neck pain so severe that you are incapacitated for a week just by bending your head forward is unlikely to be caused by weak muscles.
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.