Relatively new to this forum, I may be mistaken, but it looks as if no one responded to your post. I can understand completely your problem with some doctors' attitudes. When I first suspected PD, I saw two neurologists. The first one was ignorant of some of the most common symptoms of the disease and told me flatly that I would be in a wheelchair within ten years. What an unnecessarily and inaccurately devastating diagnosis! The second one confirmed PD and immediately offered me sinemet, which I declined. Not until I got to a Parkinson's clinic and later (in another state) a movement disorder clinic did I receive proper treatment.
Your husband is lucky to have a spouse ready to fight this long battle with him. And I probably don't have to tell you, a doctor, that current medications and the slowly progressive nature of the disease make it possible to keep PD at bay for quite a while in most cases. My first symptoms appeared about 19 years ago, and I am still in the early stage of PD. I hike, play the piano, and manage my own household since my husband's death over three years ago. ( By the way, our wedding anniversary was September 4.)
I do not often check new threads in this forum and am consequently very late in responding. I just hope that you will look back and find this post.
Best wishes to you and your family!