Your situation certainly could be myelopathy from spinal cord compression. The physical examination is important here. If you do have cord compression causing your imbalance, you will have long tract signs (hyperreflexia and Hoffman’s sign) which would not be present with a vestibular problem.
You MRI findings (“C5-6: There is a diffuse disc bulge/osteophytic ridge complex at this level which causes moderate narrowing of the central canal. There appears to be mass effect on the anterior spinal cord”) would support this diagnosis.
I agree that you need a surgical consult from a spine surgeon or a neurosurgeon.
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.