I suggest that you see your Neurologist, and ask for a Dat Scan, or Spect Scan I think some call it. This will once and for all tell not only you, but your Doctor if you are suffering from PD. If you have already had this scan, then it is the Neurologist you need to see again, and tell him the problems you are suffering, and also of your little drugs trials you have been holding.
Good on you for trying the placebo experiment, although I think it would be frowned upon by some professionals.
GOOD LUCK FOR THE FUTURE