You are in the right place on these forums. Agree with just about everything stump put out there. Attitude critical. Being in good shape a plus.
Switch to an MDS if possible if you don't have one. Learn all you can about PD and be an "informed consumer" with your caregivers. There are some very educational fact sheets at www.pdf.org as well as this website.
For me I have found that the disease progression on the physical movement side is on a different track than the mental cognitive side and it differs per individual of course. The drug equation requires periodic attention in terms of what your take as well as strength and frequency/interval. I did not need any drugs for first year at age 60 with a right hand tremor like yourself and have progressed from there over 4 years. There are some good discussions about meds on both the doctor and pharmacy sections of this websites forums. Every new drug introduced to me was carefully titrated up to the desired dosage.
You are a cancer survivor and will deal with PD head-on and well I think once you get your bearings on this! Hang in there!