My diagnosis was very similar to yours. I had tremor in my left hand/arm and left foot, terrible short term memory, and neck stiffness and pain that led to severe headaches. The neurologist looked at me for a few minutes, did some basic neurologic evaluation, and had me walk for him. He then entered a few notes into the computer and bluntly told me that I had PD. Although I thought that I had PD due to the tremor (that's why I went to the doctor), I was shocked that he was able to make the diagnosis so quickly. I asked him what the basis for his diagnosis was. He told me that I had dull facial features (a PD mask), my left arm didn't swing when I walked, he witnessed the tremor in my left hand and foot, balance issues, etc, etc, etc. As it turned out, I had 12 symptoms (out of 16, I think) on the PD chart that was hanging on his wall including no sense of smell.
If I hadn't asked the basis of the diagnosis, he would not have told me. So, at your next appointment, I would suggest asking him. Also, I would be interested to know how long you took the Mirapex and whether it had any effect on your tremors and other symptoms. I am also on Mirapex and it did significantly reduce my tremor and improve my balance.
Not taking any PD meds (stopped taking Mirapex due to fatigue)
Using exercise to battle PD
Walk minimum of 12,000 steps a day which improves rigidity,balance, etc (everything but tremor)