Yeah, probably just a sinus infection.
I'm guessing that I had a sinus infection before the injury...because it showed up on the very first CT scan. I didn't notice the pressure before...but this injury causes you to over-analyze yourself and you start to pay more attention to the way your body is functioning.
That's how I am anyway...its an anxiety type thing, even if your not worrying about it...You just start noticing every little change and symptom in your body.
Anyways...don't stress on it

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Nick