Welcome to the forum, family man!
The online name you chose says a lot. Your post shows what a compassionate person you are and how much you care for your wife. I think Polly M is right: it takes time to adjust to a diagnosis as serious as PD, and after a patient reaches that point of acceptance, the load feels lighter. Don't despair. When you get helpful advice either online or from a PD nurse, it will make a big difference in your outlook.
Also, for most of us PD is a slow-moving disease. I have had it 16 years and am still living a relatively normal, certainly active life. Many symptoms can be controlled once you find the right combination and dosages of medications.
Best wishes in your efforts!