A lot of new vapers will find themselves asking "is this new ache, pain, or symptom caused by vaping?" I know I did it. Not saying you should brush off any changes in your health, but just try not to freak out every time you sneeze after a vape. I'm not saying you did, I'm just saying I kinda did for a while. Now my sinuses have been a curse since the day I was born,, so there has really been no change for me there.
You could be actually developing a legit sinus infection or blockage, but I doubt it's from the vape.