Possible Nose Job for an Asian with a flat nose?

I have a flat nose and it's pretty hard for me to find glasses that fit my face and nose bridge. Not only that, but once allergy season comes around, it gets really hard for me to breathe through my nose. I was wondering if getting a nose job could help me and if I can get my insurance to cover it. If not, how much should I expect for it to cost? And what kind of nose job would work for me?