Mrs Mac welcome to the forum.

You write:
"Husband (49 yo) felt the first tremors about 10-11 yrs ago. Very slight in right hand."
These details fitted me exactly when I was diagnosed.

There's no denying that it's a bad illness to have. But, if you can come to terms with it, it's possible to have a good life for many years. Now, 8 years after diagnosis, although my symptoms are worse, I am happier than I was in the first 5 or 6 years post-diagnosis.

Advice is difficult because things vary from person to person: what may work for one may not work for another.

But what helped me the most was joining a support group, part of Parkinson's UK (there are equivalents in other countries). Unfortunately, it took me many years to join them. Beyond that, this forum has been a great help.

It is worth contacting 23andme who will give a free genetic analysis on a sample that you provide.

Finally, I would advise your husband to keep track of his symptoms, so that he can see whether changes he makes to his meds or lifestyle are improving things.

Thanks for joining this forum: the more people there are, the more that we can learn from each other.

John