with PD we also may have other conditions that require medications.
in my experience the best medical professional to prescribe meds that help other issues without contraindications to necessary PD meds is the psychiatrist. PD is a brain disorder and so are depression and sleep. also the psychiatrist has a 50 minute appointment with you and has time to hear exactly how you are doing. when you see the psychiatrist one week and discuss your symptoms ask that by your next appointment they will have researched and determined the best meds to take along side your PD meds.
drugs are a minefield ..Valsartan my blood pressure med recalled as causes cancer.