cervical dystonia
"Each time I have had injections, the spasms stop within a couple of days, but then I have severe weakness in my neck and weird gait disturbances and muscle weakness in my lower extremities for up to 3 months.  Just about the time I decide I won't get injections again, I have had pretty bad neck spasms and upper back pain, making me reconsider getting more treatments.  It's a vicious cycle....."