Parkinson's is often very hard to diagnose.1. I have seen some tests mentioned in this Support Group of some tests that are perhaps better than others, but so far as I know there isn't a definitive test.2. It is further complicated by the fact that there are lots of diseases that mimic Parkinson's and if the doctors jump on a PD diagnosis before they have ruled out the other possibilities s, then the treatmenr for Parkinsons may not be helpful. 3. Parkinson's can manifest itself so differently from patient to patient. Some folks with PD don't present any standard way. I had only one persistent symptom - just growing profoundly fatigued more and more. That's not much to go on. All of what all the others above said is true. It's vey frustrating, even when you have the best doctors that have ever graced the planet.(which I was fortunate to have had..) Most of us have been there, done that, and got the T-shirt. ;It sounds trite to say it, but it's true: Just take one day at a time; do what you can,but also take care of yourself. When you fly on an airplane, the safety instructions tell you that if you are traveling with someone who needs help, put on YOUR OWN air mask first (because if you faint from lack of air, you're not going to be much help to the persol you're traveling with .Sometimes an occasional massage might help. I've watched m beloved husband do so very, very much, and get so very very tired, and after my diasgnosis, when I get meds that helped , I could do more an more on my own and was able to fre up a little bit of time where he didnt' have to wait on me hand and foot and could do a few things he enjoyed. like sleep. through the night, which he hadn't done for a year.Celebrate the little victories when you can.