Do you have any weakness in one side? Can you taste with both sides of your tongue? Talk to a doctor ASAP -- I had similar symptoms once, but waited three days before going to the doctor. She sent me to the emergency room saying there was a chance it could be a stroke. Turned out it was Bell's palsy. But because I waited so long, I never got back full use of the left side of my face and I have no sense of balance. Hopefully you just have some odd nasal blockage, but seriously, don't take risks with this kind of thing.