I read your post with great interest, and have had a similar experience with my wife some years ago and fully understand your concern, however you sound to me like the kind of person, and have the kind of family that will get through this.
It can seem like a 'Bear Pit' sometimes, where all the people you know have the ability to bring you too your knees, be that well meaning relatives or friends. They all assume they are experts concerning the PD (Only because they have managed to read a website, and invariably know someone, as we all do, who has PD), and somehow think that it is there responsibility to empart their thoughts on you .... often needed like a hole in the head !.
Regarding the nurses, and quite often other medical professionals, they have the qualifications because they are able to pass exams, always speak to people when they are often emotionally on their knees, and have the bedside manners that often leave me speechless, but amazingly allow this power to go to their heads. You might as well ask King Herod to run a cresh !!. The only people in this club, with any complete expertise are the ones living with people who have the condition, and I think 'Hats off to them', as they 'Walk the Walk' and don't just 'Talk the Talk'
I have found in the big scheme of things that a person like you, being the member of a 'close knit' family, with an infectious attitude to laughter, life and fun is the secret to dealing with this condition.
We are all on this train and nobody knows which station we're going to stop at, but as long as a person like you is driving the engine, the drugs, the nurses and the doctors are merely bystanders that occasionslly have to put the coal in the boiler (and if they're not there you and your family can do it)
Continue to be strong, there are people out here who know what your going through, and I'm sure will be there when you need them most remembering 'footsteps in the sand'