I had my surgery in 1/2005, retrosimoid approach removing a 1.5cm AN.  I can experience neck pain also and if ignored leads to a headache.  I discovered this while I was walking my dog.  My field of vision bounces up and down while walking, which is due to recently diagnosed nystagmus.   As I am looking straight ahead I began to notice how my neck muscles were constantly working to keep me upright.  By the time I am home I feel tired, my head feels full and there is tension in my neck spreading up to my skull.  Being a massage therapist and yoga teacher I have helped myself with self massage using my fingertips and thumbs all over the tight areas of my neck, occiput (back of head), and jaw muscles.  After this I will stretch the neck in all directions holding each position while inhaling fully and slowly for 5 breaths for two rounds.  I found pointing my chin up (which contracts the necks muscles) would hurt at first, but after the second go around the muscles released.  Sometimes I will use yellow tennis balls placed in a sock holding them together positioning the balls on the occiput muscles.  Then I slowly move them down the neck, breathing slowly at each move and then reverse the process.  This has helped to relieve the tensed muscles caused I believe by the head constantly moving in micro incrimints to keep us balanced and upright.