Narcotic drug Addiction.?

Hey i need help i'm having problems with my pain pills i take oxycoden.I recently noticed i'm getting addicted to them ive been take two with in 4 hours when it should be one every 4 hours.I'm only 15 and its the only pain pill that works i dont want them to change it.ive taken dozens of other pills nothing works.What would be the best way to deal with this?