I have had a throbbing sensation to the back of my neck mostly on the left side, at time the right. And it is more severe in the morning when I wake up. Have had all types of test done Heart, arteries, brain scans, The only thing that they have found is degeneration condition of the spine to include the neck area. Any ideas on what the problem could be. A surgeon want to give me a epidural injection next week and I am concerned with that procedure.