I can share my experiences we have with my dad & his PD doc.
She will listen to mom, dad & I when we have a concern and make adjustments to meds if there is a need.
All for the best for his mobility and how he feels.

She never has brushed off our concerns..

She has tried anti anxiety meds a few times but they don't seem to work well for dad , so he is off those after a short trial each time.
He is also on a very small dose of Mirapex along w/ his carb/levadopa.
It may help the other med work better -but for some it has too many side effects..

Is your dad on any other meds for anything beside the dopamine?

If the doctor he is seeing for PD is not a specialist you may have trouble getting the most knowledgeable care for him...