You have a common hereditary spinocerebellar ataxia, and stem cell transplantation has no definite effect on it. Rehabilitation training is recommended.

(Dr. Wang Han from Peking Union Medical College Hospital solemnly reminds me that I can't fully understand the illness because I can't see the patient face to face. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )