Hi,
Thank you for posting your query.
It is unfortunate that you have spasmodic 
torticollis and head tremors for long duration.
At present, repeated 
botox injections are the best available treatment to ameliorate this condition.
Moreover, botox injections are completely safe too.
I hope my reply has helped you.
I would be pleased to answer, if you have any follow up queries or if you require any further information.     
Best wishes,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
For DIRECT QUERY to me:  http://bit.ly/Dr-Sudhir-kumar 
My blog: http://bestneurodoctor.blogspot.com/