What Causes Clogged Ears With Hoarse Voice?

I have had difficulty with my ears feeling clogged and my voice feeling hoarse for about 2 years. First, my ears would feel clogged and when I would talk it sounded like I had my fingers in my ears. I am a singer/songwriter and this problem has kept me from performing. In the last year, my voice has become lower in pitch and sounding somewhat hoarse. I have been to an ENT doctor at the VA Hospital and he did an exam but was unable to find anything wrong. He ordered a CAT scan of my sinuses and found nothing but a slightly deviated septum. I clear my throat a lot, and I often feel as though I need to swallow something. Do you have any idea what is causing these symptoms?