Gross sinus problem?

I constantly have to clear my sinuses. I snort & clear my throat throughtout the day to try to get rid of the mucus buildup. In the morning I have to snort & cough up the mucus buildup. I know this is gross. I don't think I have allergies. Its just embring when I have to do it at work and it is so loud & everybody hears it, but I can't help it! Any suggestions?