thankyou mrsd for your insight on my condition! i was not aware of that regarding the MRI scans. I did have two EEGs however, and both showed as being normal? I will take your advice and push to get a PET scan, but my neurologist is unfortunately rather single minded and previously did not think i needed a PET scan, or it would not show anything significant. I disagreed, but I am not a doctor of course. I read the article regarding parkinsons disease from heroin, and I actually did go to a Parkinson's Clinic. Luckily, the neurologist there as well as the panel of neurosurgeons that went over my examination and MRI/EEG/CT Scan results felt I had a problem in my cerebellum. so yes, I definitely agree I should have a PET scan or fMRI to show exactly what the problem is. I have been improving steadily as far as writing and standing for long periods of time and walking with assistance. I actually had a great day at physical therapy! thankyou for all the information you've given me.