I have found a product called Hydrasense very helpful. Sold over the counter at drugstores, it's desalinated sea water under pressure. You squirt it up your nose and it helps rehydrate and replace the fluids your sinuses stop producing so much of post-fifty. I had lost my voice altogether, then recovered it partially but unpredictably. Now it's the best voice I've ever had, though significantly plummier than when I was a girl. I just used it to record my debut CD (which, BTW, will be released at the Free Times Cafe in Toronto on October 27th). Good luck and good health!