My mom got diagnosed a year and half ago. Her doctor is an MD that also does holistic medicine. She went on a diet very close to Ketogenic strictly for 6 months and then added back some fruit but remained off all sugar, white flour products etc. Just with this diet her tremors went to a minimum and have remained that way. Something to look into......She also takes something called Neuro Replete
There is some experimentation going on in both Singapore and China involving treatment of Parkinson's with stem cells. To date there has been one document successful outcome.
Look up the Singapore research. At one time they had a physician at Harvard Medical School who was the point of contact for the experimental protocol.
Dr. Enrico Fazzini did some research he is in NY he specializes in Parkinsons also try looking here http://www.pdf.org/en/about_pdf might help other then that I am sorry I can't be of more help.