There are doggie calmatives - check online for "canine calming aids" or "natural treatment for hyperactivity". www.drsfostersmith.com has two I have used for dogs who get upset during thunderstorms and travel - they've worked. I'm sure there are others.
On a more behavior modification side, there are devices that you can use to alter the behavior over time. We tried a bark collar and it definitely worked, even after we quit using it (though occasionally we had to return to using it briefly). Again, www.drsfostersmith.com under "bark control", "behavior control" and "spray correction".
Even with the collar in place, if there's a really good reason to bark (possum on the back porch) they're going to bark... which I think is a good thing.
Good luck
then really isn't alot out there to help try discipline. he is still in his prime so the hyper is just his way of showing he is happy.