How can the condition of HD chorea patient be improved?

Hello doctor,

My father aged 54 years is suffering from HD (Huntington's) chorea. The symptoms were visible eight years back itself, but we felt it is quite common and the days passed on, and the symptoms became more prominent. My father's elder sister also had huntington's disease (HD) chorea, and she passed away due to depression. We started consulting doctor seven years back. From Ayurvedic to scientific, we have tried in all ways, but the doctors say that there is no proper treatment for this disorder. He is continuously on medication, but it is of no use. He is becoming weak day by day though we are giving him health supplements like Herbal Life to make him strong and strengthen his body. Please help me to recover him. Currently, he is on Petril, Amentral, Evion, Parkin, and blood pressure tablets. The laboratory tests performed were blood test, urine test, magnetic resonance imaging (MRI), and computed tomography (CT).