My nose is always clogged, and i have extreme bad breath?

First I would find another doctor. You need tests ran. Find a good ear, nose and throat doctor. Also you should see a periodontist who deals with gums and bacteria in the mouth (you may need a referral from your regular dentist). The periodontist gives a more extensive cleaning than your dentist can give and they help get to the bottom of your bad breath problems in your mouth and throat. So between the Periodontist and the Ear, Nose and Throat doctor, they should be able to help you.