Why are you snorting them besides saving cash? Does it get you high quicker? You need to do what flatdice suggested, taper off. If you can, take them orally, not nasally. See a doctor about your nose, you may be in the beginning stages of a deviated septum, who knows? You need to seek medical attention for that, though.
Best of luck to you
stop snorting them dude and start tapering off