Lightheaded...help

Hi,
for about 5 days now I have been very lightheaded, tired, at times dizzy and I keep hearing this sort of wooshing sound in my ears (that is getting worse). One day I will feel nausiated and the next more lightheaded. I just feel like I am getting worse.
I went to the doctor and he pretty much told me he had no idea what was wrong and said it was most likely a viral infection that is going around. I can't stand feeling like this. The only time I feel alright is when I am lying down.
Anyone have any idea what it could be?

Thanks!
Michelle