Parkinson's Disease Support Group
Parkinson's disease is a movement disorder often characterized by muscle rigidity, tremor, a slowing of physical movement, and in extreme cases, a loss of physical movement. The primary symptoms of Parkinsons are due to excessive muscle contraction, normally caused by the insufficient formation and action of dopamine, which is produced in the dopaminergic neurons of the...

It has been recommended to eat some crackers or a plain slice of bread first to help with the nausea. It has also been suggested to avoid eating anything protein at the same time, since the receptors that take in the medication are the same ones that take in protein.
Another thing suggested was to try was a slice of ginger root in hot tea or water. Ginger is an anti-nauseant, but it also slows the uptake of medications. And it may not be compatible with other illnesses like diabetes, and can thin the blood.
Some PD medications are also known to lower blood pressure which might feel like tired and dizzy. In addition to the doctor, tell the pharmacist about the reactions. The pharmacist may be able to guide to the best information or questions for the doctor.