I was diagnosed in 2008 after 3 different scans as Parkinsons is very difficult to diagnose. , I was already seeing a Neurologist as was referred to him before the scan by GP. Neurologist then referred me for a scan which was only to confirm no other damage was present, after this I had second scan and a third the third being taken after an injection of some kind of radio active material which does show up the Parkinsons. I would phone again and ask where you are being referred it might be back to the Neurologist. My first symptom was a tremor in my right arm, but now on meds am feeling move positive.
Hope things turn out well