hi, thank-you for providing the brief history of you. As you have a dull neck pain it could be due to inflammation the facet joints or may be due to nerve pinch. Also, this occurs due to muscle weakness and massage actually makes muscle more weak and leads to abnormal symptoms. I will advice not to undergo massage. Also, having an x-ray or MRI of cervical spine will help understand the pathology and also a clinical examination. You may need to see a physical therapist who can help reduce the pain and also strengthen the muscles which will help avoid this dull aches. also, the double vision you need to take a further advice and exmaination from a neurologist. I feel it was symptomatic due to massage but in future if it comes again you need a Neurological examination. In my clinical practice most cases are restricted for massage and physical therapy is advised. Regards Jay Indravadan Patel