I know it's an American site but try http://www.pdtrials.org/
At the very least it is full of very useful information (in preparing for a trial etc.)
It's actually easier to get into a trial if you are relatively "healthy". Trials have been known to be skewed towards patients with no co-morbidities and a lot (if not the vast majority) do not want patients taking PD meds.
Maybe, in your circumstance, a US trial cannot be ruled out?