NPC is really rare amongst Caucasian Americans. Being Chinese is a definite risk factor for NPC. EBV is a risk factor, although very slight. Most people will test positive for EBV. It's almost universal in the States, however, only a small amount of people, less than a couple thousand, a year ever develop EBV State-side.
You could have a broken blood vessel in your nasal passage from the dry air. Are you using any inhalers? My dad had something similar happen. We thought it was NPC, but the ENT did a scope and found nothing. MRI confirmed it a week later.
Get the scope. That would be an easy confirmation. An FNA biopsy of the area would be another.