Please help me i am worried?

Phantom odors can be one symptom of a brain tumor, but they can also be symptoms of several other things that are harmless. If you have lots of pollen in the air and a sore throat, chances are that the smell was caused by a blob of post-nasal drip that flowed out of the sinuses and it had pollen or other smelly things in it. This isn't a big deal and its pretty common in people that have seasonal allergies.