Parkinson's disease + Side effects?

I have been diagnosed with Parkinson's disease in July 2012. Over the last 4 and a half years the deterioration in my condition has been quite fast. I experience severe pain in my shoulders stiffening of my arms and legs, I lose balance frequently and tend to fall backwards without support to my back. 1 doctor said that it is due to reduced postural gravity index. Few doctors in the last year that I have consulted have ruled out the possibility of performing deep brain stimulation in my case. I have heard about stem cell therapy to cure Parkinson's disease and that trials in animals is successful. What I want to know is weather there is a possibility of a cure Or improvement in the conditions with the help of stem cell therapy. Is there any doctor or Hospital in India that performs stem cell therapy treatment for Parkinson's disease? If yes will there be any side effects?