What Causes Body Tremors Along With Stiffness On The Left Side?

To whom it may concern, Over the last 7-8 years I ve experienced a cluster of neurological symptoms; Some of these symptoms are, but not limited to: Tremor and weakness, stiffness all on the left side, my ability to walk and overall coordination has declined over the course of these years. Then the neurologist did a DAT-spect study and diagnosed me with early-adult-onset Parkinson s disease. I am now nearly 46 years old, and since that diagnosis, I never believed I had it. A year ago I had a bad fall at home and suffered a subdural hematoma, which did resolve itself, however I still suffer from headaches and my symptoms have rapidly increased. Last week I asked for an MRI of the head and neck; The results floored me. It shows a subarachnoid cyst, with CSF problems and demyelination. To say I m confused would be an understatement, but suffice to say I think the original diagnosis was wrong. Any thoughts Doctor? Thanks for any help you can provide, Johnny