Started happening a few days ago, for some reason I’ll get the urge and then feeling in my nose then it’ll go away. Wtf why is this happening?

I’m afraid it might be something like brain cancer or something, also it’s just really annoying lol. Especially since I have seasonal allergies so I’m really used to sneezing. 

Also I had back pain/body aches for a couple days last week could this and my lack of sneezing be a sign of a brain tumor?