Could moderate to severe stenosis in cervical and thoracic spine cause pain, weakness in the upper arm, dizziness and tinnitus when stretching my neck?

Some advice: Although your symptoms could be prompted by cervical stenosis or even nerve pinching at the foraminal outlet, the dizziness, and tinnitus, makes me wonder about co-morbidities, and would think of inner ear issues, but also vascular problems, such as subclavian steal syndrome. Find a neurologist who is open to investigating this more thoroughly.