Im diagnosed with cervical spinal stenosis.but,my main symptom is a constant headache.i had a brain injury 5 years ago and my neurologist thinks this may be irritating the nerves.he said there is only conservative treatment, which has failed to work?

Try non medical Tx : You have a doctor and a diagnosis. Now they tell you there is no active treatment, so that rules out procedures or curative medications. To me this means try options such as physical therapy, relaxation exercises, yoga, or even hypnosis. You’re young and will live with this for a long time. You should incorporate your options into your lifestyle.