A little less than a week ago I woke up with a migraine and a REALLY foul taste at the back of my throat and smell in my nose. The migraine went away in a day, but the taste/smell is still there. It smells rather like a rotten potato, and tastes the way I would imagine a rotten potato to taste. A friend said that it might be a cavity, so I have a trip to the dentist planned next week, but I'm wondering if it might be some sort of sinus infection, since I occasionally have to blow my nose and there's a thick milky pale yellowish-green fluid coming out. Every time I blow my nose, it smells like someone is shoving a rotten potato into my face, so I can't tell if the smell is coming from the fluid I blew out or not. I've been brushing like crazy and rinsing with Listerine, but that doesn't make the taste go away completely, and it keeps coming back.
Can anyone help? I'm almost scared to go to the dentist only to find that he can't fix it.