your symptoms don't sound much like my understanding of PD, in PD your limbs are not weaker, headaches are not a symptom I have heard of, and brain fogging at your age is usually caused by the dopamine agonists we are given to treat PD.

However if you are worried then see a Neuro, PD is hard to diagnose for experts, (I needed radioactivity injected into me to confirm my dx), but it doesn't sound like you have PD from what I know of PD.

Neil.