Meniere's or something worse?

I'm hoping that I might get some help here. Six weeks ago, I woke up with pressure in my left ear and not being able to hear a thing in that ear. The next day I became extremely dizzy, light-headed and nauseous. I also experienced, what I call, "flash" headaches...a sudden, severe pain that lasts only a few seconds. A day or two later, the constant, high-pitched "white noise" began. As the weeks progressed I started getting pressure and noise in the right ear, also. During the last few days, I've experienced vision problems including double-vision. All of these symptoms still exist and are constant, except for the headaches and double-vision which come and go. Oh, I also have pain in the left ear and cheekbone from time to time.
I've been to my family doctor twice. I was put on antibiotics twice and then a medrol pack. Since none of that helped, he sent me to an ENT. The ENT gave me 4 minutes of his time, looking in my ears, nose and throat and then holding a tuning fork up to my ears. He then told me that he thinks I have Meniere's Disease and ordered a hearing test.
I've done quite a bit of research on Meniere's since that appointment and, although some of the symptoms fits, I'm still worried that it might be something else.
Does anyone have any ideas? Someone suggested a tumor. Thanks for any help you can offer.