Childhood Disorders

My daughter 11 years old, bright, fun loving has developed a pattern of behaviour – habit, that she struggles to get rid off. The only way she stops one is when she starts another one. This is usually moving head particular way very frequently (every few seconds) – which in return can cause neck pain. To prevent that she just develops moving head different way. She is aware of it, but unable to control.
A couple of years ago she had an obsession with a worry that something bad will happen to her – what if she starts choking, bleeding…..this has stopped but it seems that it moved to the behaviour described above.  Is this associated with OCD? What help can I get for her?