Tree expert needed. How can I save my tree? ?

I have a beautiful, majestic Austrian pine tree in my back yard. I planted it when it was just a sapling, and it has grown over the years to a height of 20 feet, and is perfectly symmetrical. This summer I've noticed that about a third of the tree has brown needles on its boughs, and someone told me it's dying. We've had a lot of storms in my area, and I read in the local newspaper that some pines are afflicted with a disease called pine wilt, and that spraying it doesn't really help much. I would hate to lose this tree. Is there any possibility that it will rebound and recover next spring? It is still producing pine cones, and the birds are still perching in it, which are positive signs.